I used my Clevinger EUB for big band rehearsals. For me it was better than BG because I have grown up with DB and hardly be able to play BG. I think in a big band it doesn‘t make much of a difference unless it comes to quieter/slower pieces.
But I enjoy playing my large DB a lot more than the EUB which is OK for me.
I often played the EUB in a Cuban-style Latin band, but have used the DB there too. For rehearsals and tight stage space I use the EUB. Feedback was not a problem with DB using a pickup and good cab placement. But it‘s mostly me hearing the difference.
Switching to an EUB means you should try holding it or playing it for a longer time on a stand.
Personally I highly dislike the stand as I don‘t like to be fixed in position but move a bit with the bass during playing. Better to distribute weight on (older) joints with moving. Moving my body with the fixed instrument makes it harder to feel at home.
The T-foot of the eminence seems to be a good idea until you find that it doesn‘t allow any (!) turning. And I still miss the body support for distance.
I use the body support (covered with rubber foam tube to better stick to the clothes), not exactly at the same position as the shoulder of a DB, but with the same function and a straight endpin (I modified the angled one of the Clevinger because the bow takes the EUB out of position). Changed the rubber foot to a thick one where I cut the bottom in a about 40 degree angle and rounded it a bit. Then put it onto the foot and rotated it so that the bass naturally falls into my playing position.
There were good reasons for my modifications, so most EUBs might need tweaking until you feel at home with them.
I also have a cheap Stagg EUB that got some changes, mainly foam under the underlength and different bending of the upper and lower part of the body support. The main problem is the bridge that is equal height for all strings and heavy because of the thick metal adjuster parts. And the fingerboard is often not planed and hard to do because of the laquer finish that will (partly) get removed.
The cheaper ones don’t have a separate fingerboard, it is one part with the neck.
Newer model changed the tuner to DB tuners and have a separate fingerboard, but the bridge is still the old design.
I take the Stagg with me during holidays and when I go teaching by public transport (very seldom) because my other instruments are 5-stringers with a high-C.
But my DB is a 4/4 5-string that is possible to take with me in public transport (sometimes the ceiling is a bit low or it only fits in a few places), but even with wheels not that much fun to do regularly. For the first big band rehearsals I took my DB with me by public transport (bus, train, metro), but always was afraid that a potential hard braking would smash someone into it. I also took it by car, but finding a parking space was always a gamble.
You can get a straight endpin and body support for an NS instrument, but they are expensive. You might need a neck heel indicator on the back for a stick type EUB which you might need to make yourself to have the same orientation as on a DB.
I strongly recommend an EUB made/developed by a DB player if you want is as a replacement for a DB. This can get easily expensive. Have a look at a (used) Yamaha or the Italian MK EUBs by Mirko (where you can custom order some stuff too). Or perhaps learn how to avoid feedback problems (different pickup, speaker placement relative to DB body).
My DB is made for orchestra (intended to use a low B), carved, lowest wood grade which means no flames but good wood. I have it for about 35 years now and the quality is good enough for my chops. I used it for orchestra, jazz combo, big band, Tango and Latin ensemble and it worked well for any case. It took a while to make it working well (fingerboard planing, moving the soundpost, bridge reshaping, fingerboard shim to change the angle) but it is a great instrument now.
You might want to visit a good DB luthier to setup your instrument to find out if it could work better or if you want a different DB for a better sound.
A plywood DB is more robust and can work better with amplification. I won’t take my DB to open air gigs without a rain shield, that’s where I take the EUB, at least as a backup in my car.
So, you need to think a bit about that.
Check if the aspects that lead me to select and change my EUBs may apply to you too. I also got my EUBs very cheap, I wouldn’t have bought one for the regular price yet.
Also an EUB is mainly useful for music where you want to combine effects with bowing (like Eberhard Weber did). And even this is possible with a DB, but needs some modifications and sounds a bit strange when the acoustic sound is audible too.
Whenever possible try before you buy or buy only if you can give it back after a week or two.
Good luck, however you decide!