What is main brass instrument? trumpet or trombone?

Hello, I am currently thinking of learning trumpet or trombone.
At this stage, I just want to know what instrument makes the brass sound?

say, if there are no trumpet but only trombones in a jazz band, would it still sound like brass?
and if there is no trombones but only trumpets in a jazz band, would it sound like brass?
what is the main instrument that produces the brass sound.

Trombone is an odd member of the brass family - if you learn to play it you will have trouble playing all the other ones, wheras if you learn trumpet you will at least know the fingering for the other brass instruments. However either trombones OR trumpets are pretty indispensible for a jazz band, though I'd say trumpets were probably more important for the melody and trombones for the harmony and timbre.

However, trombones are a rarer instrument, less people play them well - so if you were to learn trombone you'd be more valuable. If you're learning with the aim to get into a jazz band then I'd say trombone was your best bet.

The trumpet is the brass instrument. (Actually, the French Horn is THE brass instrument, but that's for classical not jazz).

All other brasses are trumpets with a gimmick - trombones, tubas, whatever. Learn the trumpet first and you'll be able to play all the rest very easily.

the trumpet is more often than not the lead brass instrument, but in a band situation trombone and sax work well without trumpet at all, it's a matter of range!
true, trumpet can transfer to valve trombone, but the difference between tpt and slide trombone, isn't that much, you just have to get used to the slide/ valves respectivly. it's not a ba thing to play both, but find first which instrument attracts you more, personal choice is more important to you motivation to the instrument for now

Borth are brass instruments and have the 'brass' sound you refer to. The sound is created by a lip 'buzz' versus a vibrating reed on woodwinds, like the saxophone. The trumpet is usually heard above the other instruments when playing ensemble, due to its timbre and pitch. It is naturally louder than any other wind instrument.

Personally, I prefer playing with trombones, as the sound blends better with saxophones. I don't have anything against the trumpet, except when it is played too loud or out of tune. I believe that trumpeters are more often out of tune than trombonists.

Well, I think that no particular instrument is fundamental in creating jazzy sound, except for a rhythm section. All of the winds are of equal importance. Without trombone, the band will lack a thickness that will create the desired sound, but without the trumpet, the swinging, in your face feel will never be quite the same. With either part missing, it would not soudn as good. My advice is to listen to alot of jazz. If you like the brass sound, try big band. I recommend 'Gordon Goodwin's Big Phat Band'. Look them up on Goodsearch.com and there is clips on their site. Decide wht you want to play by what you hear...

Here is a band from New Orleans that is 5 trombones and 1 tuba. Check em out. Just something to add to your research.

Bonerama.net

They both sound like brass, just in different ranges. However, trumpet is the most recognizable. But that's really not a very good reason to choose one instrument over the other. You should try them both and see which you are best suited for. Personally, I love the trombone and often find trumpet too harsh.