I quite liked them all, to be honest, but then I am a wax guy.
50Cal Pentawax was the most forgiving - it's easy to apply, easy to remove even if you leave it to cure forever (well, for 24 hours anyway) even when over-applied. You can apply to the whole car, go and have a cup of tea (it does need 10-15 minutes to cure), have a nap, go to the pub, get drunk, pass out, sleep off the hang over and have another cup of tea before removing it without any issues (with the wax at least). It even smells pretty good too.
AF Desire was easy to apply, easy to remove up to about ten minutes after which time it got progressively more difficult and needed some QD to remove the over-applied bits fully after 20+ minutes. I'd suggest doing no more than 2/3 panels at a time. It smells fantastic, slightly better than Pentawax in that regard.
AW Desirable was easy to apply, easy to remove up to about 5 minutes after which time it got very difficult to remove very quickly even with a QD, I ended up having to reapply a small amount of the wax to remove it after 20 minutes. I'd suggest doing one panel at a time with this one. It smells pleasant but nothing particularly outstanding like the other two.
Not so long ago rumours were rife that Desire and Desirable were actually the same wax - Anglewax manufactured, Auto Finesse re-branded - however I, like almost everyone else who has used both, can confirm... they ain't. Not even nearly. There aren't any rumours to dispel about Pentawax. Yet.
Looks - really can't distinguish between them under the woeful lighting in the garage to be honest/ I'll get some pictures when it sees daylight again at the weekend and re-address this and water behaviour then.
Durability might be tested, but I was planning a proper detail/summer prep. at the end of the month so they'll probably be removed at that point. I may reapply to my test panel afterwards though - I might even chuck a few more into the mix...