[rayjay]

I started in 2002 with H. reidi and I've never heard that they haven't been captive bred as long, nor have I heard that they stop eating frozen because they haven't had as many captive bred generations.
I have heard of many species stopping eating frozen when given a lot of live food but it has nothing to do with captive bred or how many generations or what species they are IMO. It is often an individual rather than all seahorses in the tank that this may happen with.
It is true that the reidi pelagic fry are harder to raise as they are a bit smaller and they don't hitch at birth like the benthic erectus fry.
As for ease of keeping, I see no difference between erectus and reidi myself.