I am newbie and I was thinking to buy an Aerobars, but I do not know which one. Any recommendation between the profile design models T1, T2, T3, T4 & T5?
Much of it will come down to what you find most comfortable. In my case, I've used the T1 type of bend (see the pic below for how I used to use them), but cannot stand the T2 type. The T3 type is a copy of another design that went by the name "wrist relief", which should give you an idea of why the design came about. Try them out if you can, and see which one feels best to you.