It'd be for recording and live use at this stage. Mainly looking to decide between a new rig or a Noble.
For live use:
I'm sure the Noble will sound great for recording but it's a bit overkill for playing gigs IMO. It's hideously expensive, especially if you can't wait almost a year and pay the extra fee for faster delivery. It's also a small item that can easily get stolen at gigs. If you're using a great sounding amp I wouldn't personally even send a preamp pedal to the amp (unless you're just using a power amp of course). I've never seen the point of using a preamp in front of another preamp, in fact I find it detrimental to the tone in most cases. I normally use tube amps for gigs, combined with a 100% clean DI (pre-pedalboard) to FOH. Sometimes the amp is mic'ed, sometimes it's not, depending on the engineer, the venue and the setting (like if there's a short changeover with no soundcheck). I own a nice collection of DI boxes but I never bother bringing any of them to gigs. I just use whatever the venue provides, which typically means a Countryman or a BSS. They get the job done and I doubt if ANYONE in the audience would notice the difference if I had used a more expensive tube DI. As for sending preamp pedals with tone control/eq direct to FOH... in my experience it's usually best to send an unprocessed CLEAN DI signal to FOH. No surprises for the engineer = happy engineer = a great gig! I'm a total gear nut but sometimes it's best to keep things simple. Just a decent quality, simple DI box will do just nicely for gigs, at least for MY needs. I would want an active DI box for gigs though. There can be quite a bit of signal loss with passive DI boxes and the long cable runs you typically get on gigs, at least with passive basses.
For recording:
The Noble makes a lot more sense for recording but there are many other significantly less expensive, superb DI boxes out there. I've got a nice selection of analog rack gear (as well as plugins) so I don't really need a preamp with tone controls for recording direct. I prefer using a top quality, pure DI box. The ZOD ID DI is probably my allround favourite for recording bass. This is a tube DI (I think it's more or less a REDDI clone). It's also around half the price of a Noble, or even less if you add Noble's extra fee for faster delivery. The ZOD is a pure DI so there are no tone controls but it can provide enough gain to be inserted straight into a line level input (without a micpre), if needed.
I also like other, even less expensive DIs for recording bass. The Radial J48 can be great. The Radial JDI is AMAZING but passive (which I tend to avoid with passive instruments, although this isn't normally a problem for recording, as long as you keep the cable runs reasonably short and have good quality micpres).
As for you amp options, I've never played that Aguilar model so I can't really comment on it except that this isn't really a proper tube amp. I'm sure it's a great amp but it's a hybrid amp with tubes only in the preamp section. Like I said, I have never played this amp but I have yet to hear a hybrid amp that truly has the tone/dynamics and "feel" of a real tube amp, if that's what you want. I've played some Class D/hybrid amps where the TONE gets close but not the dynamics and the general "heft" of a tube amp. I'm not saying this is good or bad, but there's definitely a difference IMO. Personally I think much of the tone/feel we think of as a "tube amp tone" comes from the output transformers used in real tube amps. With studio gear (like micpres) I can get a very "tube-like" tone from some transformer based equipment with no tubes (like Neve), but tube gear without transformers just doesn't do it for me. At least none that I've tried.
I think my advice would be the following:
-If this is mainly for playing live my priorities would be the amp. However, I don't think you mentioned which specific Markbass amp you currently use. Markbass amps are generally very nice amps. You might like the Aguilar better of course, but you won't really know until you try one which you ideally should before spending this much money. If the general voicing is anything like the less expensive Aguilar Tone Hammer amps it will certainly be VERY different from anything Markbass has ever made!
-If this is mainly for recording the Noble will a great choice but VERY expensive for what you're getting. I would perhaps consider other options too. Maybe just a top quality DI box. If you don't specifically need a preamp/DI with tone controls there are many superb DI boxes, including tube DIs, that are significantly less expensive than the Noble. At the price of a Noble w/fast delivery you can even get a really nice tube channel strip like the UA LA-610. These are great for recording bass (but not something I would bring to a gig).
If you don't necessarily need that specific Aguilar amp you might even find a used tube amp and be able to afford both a great tube amp AND a superb DI box.
I guess it depends on whether you really need an amp (hybrid or tube), a preamp/DI or maybe just a top quality DI box. My advice is based on MY needs. Yours might be different of course.