Which Intro Guitar Tube Amp?

before doing all that, try your guitar through your bass rig
You might be happily surprised at how good it sounds!

 

“Better” is pretty subjective. What are your intentions?

Off the top of my head, I would go with a Fender Blues Jr. or one of the Hot Rods. Or, a Peavey Classic.

 

Which guitar do you have and what type of music are you into?

 

I suggest picking up the Xotic first and trying it with your bass amp like KBD recommended. It'll boost the highs and,IME, be way good enough for noodling, maybe even to play out with.

Which bass and rig do you have?

 

The Fender Bassbreaker looks interesting. I would like to check one out.

 

Blues Jr.

 

Peavey Classic 30 is an outstanding guitar amp. Takes pedals well and has a great warm tube tone. I HIGHLY recommend you check it out.

 

Here's my 2 cents FWIW.....DSL 40 - high gain, all Marshall. Blackstar HT-5 - high gain, small enough for home, loud enough for church but won't be very clean. Hot Rod Dlx - Good Fender cleans, at 40w you might annoy the neighbors a bit. Bassbreaker - EL84 powered so will lean more towards Marshall than other Fenders. The 7w & 15w are a nice size for what you want. Peavey - very loud and heavy amp, used prices will be rock bottom, probably your best value.
The Fender '65 & '68 re-issues, either Deluxe's or Princeton's will give you more classic, scooped Fender tones but come at a bit of a price. I'm from Canada so Carvin's only exist in old catalogs and back issues of rock mags so I haven't much to say about them.
My fav's currently are the re-issue Princeton's - I have '65. And Swart Spacetone's. They come in various sizes and are a great take on tweed circuits but at a price. You might get lucky on a used one. I have a stereo 5w version that will go with me to my grave. Vox AC10's get great reviews and sit at a nice size for home & clubs. For pure home use the Chinese made DSL-1 head is fantastic for the price and sounds great through a 12" - the speaker is sold separately and jumps the price up to almost real amp territory but it sounds just like you'd expect.
Good luck, hunting for tube amps can be the most beautiful pain in the butt ......

 

For $400.00 you're in the ballpark for a used Blues Jr. which might be a good fit for home & church. The 15w is club ready and with an OD pedal will work great as a home amp.
Check out the Vox AC10 if you can. Nice platform for pedals and just around your budget. It's surprisingly good for a Chinese import and I would A/B it with the Blues Jr. if you can.