Bass sax is guaranteed to get you attention wherever you go, whether this will be kind of attention that you will be needing ( an seeking) for yourself in your future career as musician is another thing.
I have met several Bass sax players ( although one of them was more a decorative object owner rather than being a player, really!). Some of them are into traditional jazz, where , often times, this instrument plays much the same role as the Tuba or Sousaphone. Some others appear to use the Bass into a more modern repertoire as in contemporary music.
Both are a niche market, nevertheless, is something can make you different if not unique and you manage to find a meaningful way to play this instrument, rather than showing of an oddity, as so many do, than you should be doing it, by all means!
You will find, I think, that the fact that you can play this in the same key as a Tenor will help you only to a point.
If you play on a bass the same thing that you play on a tenor it will sound radically different and not only because it is lower.
So, before you get into this, try to understand if you are a Bass saxophonist or you are just a tenor saxophonist looking for an expensive thrill on a bass sax! I occasionally buy alt and bass flutes in pristine state bought by flutist who thought of extending their " range" but, in the end, didn't really know what to do with it.
Another thought on the instrument.
Be very careful what you buy! I have seen and also played ( although I am not a bass player or even a good tenor player) two Chinese basses. You can buy one , on line, directly from China, but there is NO guarantee that you wouldn't need to find someone in your country, who, upon reception, will have to seriously adjust or even rebuild an unknown horn which had survived the trip from China.
Buying one of these Chinese basses in Canada or the US re sold by a western importer is not going to be cheap ( their mark up is always substantial) and you might run into some problems anyway.
If I were you I would think deeply about buying something better. The Conn and Buescher basses are expensive and their mechanics are ancient ( I had a go at one of each) but they are much appreciated for their sound.
European Basses like Selmer, Keilwerth, Noblet, Orsi ( some of these were sold for a while by L.A. Sax) , and perhaps other even rarer horns, are different with the Keilwerth being more similar to an American horns than all the other ones and with much more modern and reliable mechanics than any of the aforementioned old American chaps.
Keilwerth, if I am not mistaken, hasn't restarted the bass production, so, you will need to find an old one. Currently there is an old model available at a Dutch shop. Hampe en Berkel of Amsterdam ( they don't have it on their website but they have it in their window)
IF ( and IF is the operative word here) you like the sound of the Tubax ( available in Eb and Bb) they sport the most modern mechanics and they are incredibly well made.
In the last few years there has been much talk about low saxophones made in Brasil. They really specialize in even lower contrabasses but they make basses too. Can be interesting but not as well made as Eppelheim's tubaxes.
One of my favorite bass players has to be Scott Robinson. He has a very wide repertoire ranging from traditional jazz to contemporary music and with one of the nicest modern sounds on the Bass saxophone.