moataz,
i have a beuchat 1.5mm reversible and the cressi world comp 3.5mm... i do not have an apnos. There is one main difference, the apnos is open cell from the interior, this gives more warmth as it "sticks" to your body, but its more hassle to wear as you need water/conditioner mix...but once you get used to that its heaven.. (i also have an omer open cell interior)..
the beuchat is a great wetsuit, its smoothskin on the outside, and its really durable contrary to the initial reaction and very easy to get into i use it throughout the year until october...
the cressi world comp. tried to imitate the open cell interior wih a titanium interior lining which supposed;y gives you the sam warmth as open cell, yet is very easy to get into, even when you feel th einterior its like open cell, so far it has only been tested in my room
as i bought it at the end of winter, so in a month or so ill get to test it, i think it will be a bit too warm for the red sea most of the year, but then again that boils down to your body and its reaction to cold... some friends of mine wear 5mm even in the summer....
cheers
