The SMP Hell have slightly less padding (very slightly) than the SMP Extra, it's just better looking.
The Hell and Extra share similar shape to the Composit.
@TRA try the Extra for first timer, as it's cheap too, if you like it, get the more comfortable Composit, stiffer saddle hold you better while having a little give.
Is the hell as tall as the extra? I'm alternating 2 extras between my fixed/road/mountain bikes but the seat post is rusted in on the fixed and the high height of the saddle is a bit too much
So this is what I found.
The SMP Hell have slightly less padding (very slightly) than the SMP Extra, it's just better looking.
The Hell and Extra share similar shape to the Composit.
@TRA try the Extra for first timer, as it's cheap too, if you like it, get the more comfortable Composit, stiffer saddle hold you better while having a little give.