i would say acekard, scds and maybe ezflash for official support. dstt, r4 and acekard is quite widely used to you can expect a lot of support from the homebrew community, ie ysmenu or akaio... and to some extent stuff like menudo and dsision, which isn't really a bad thing too.
edge does have a great compatibility so it's really great as it is, though official updates have been few. team edge usually release an update every 1.5 - 2 months, but nothing major, just a few game patches here and there. don't expect much new features and homebrew support for it if you get it, though it's a solid cart with the best loading times etc.
cyclods is good too, i think the team cyclops is still developing features for it so it may be a good choice too, if you don't mind the high price