RD. the personalities are ridiculous, my devil knows when i walk into the room, she goes nuts, and she only does it for me, lol. and im not the only one who feeds her if you think thats why
I've got a 13" petsmart midas in a 60gallon who makes a great wetpet. I'd pick midas over oscar any day but giant gouramis make great wetpets if you've got the tankspace.
Never had a red Devil but I love my O!!! I like the tigers with lots of red over all the other varieties.
I'm also not a big fan of how RDs look. I saw a male Red Terror the other day at Big Als in TO. It is absolutely gorgeous. If I had 150 gals to dedicate I would stock it with a mating pair.