I have an EDGE, an Evo, a SCDS1, a DSTT and (temporarily) an R4. I have had and disposed of most of the other available cards.
The EDGE is my favorite - it boots faster than the Evo and the only feature I ever use on the Evo that is not on the EDGE is the random theme option.
Also my Evo is very tight for the TF card. I wreck a nail every time I remove the memory.
I paid less than $25 for my EDGE, I paid over $50 for the Evo. The Evo is better, I guess, but it is definitely NOT worth more than twice the price of an EDGE to me!
I didn't use the SC until I got it to triple boot - now I can use Narin's cheats. This means that the DSTT (dual-booted) is worth exactly the same to me as a SCDS1 except that SC has a much better USB adapter.
DSTT is the cheapest card that I would recommend for a casual or young player, but I would not buy one now because of the clone issue.
R4 was the best (and almost only) card when it was new. But the R4 Team is probably not going to survive due to legal issues and clone problems.
None of my remaining cards are held together by tiny plastic clips.