It basically comes down to a balance of protection (and state of mind) vs comfort (fit, temperature, price). I have a textile fieldsheer bullet jacket and it protected me very well in my crash. Most textiles have many vents for temperature and are “lighter” than leathers. That being said, leather itself is stronger than textiles, but does tend to get hot (and sticky on those commutes where every red light is out to get you and you have so sit on your bike more than actually riding it…ughh). But it does offer better overall protection, although it is more expensive.
Now I’m in college and I see a lot of guys that wear no jacket whatsoever and they blame it on the South Georgia heat. In my opinion, its better to buy a textile jacket that is slightly cooler and wear it, than to wear nothing at all. Of course I dont know where you live, but the same is true in any place that is so hot that leather can be unbearable. Also, if your a new rider and are on a budget, a decent textile jacket will be less expensive than a leather jacket and will still offer good protection. So, in my opinion, it really depends on what youre looking to get out of the jacket and what you are willing to put up with temperature wise and financially.