Personal Opinion,
Twins- I don't care for them, had 14,16oz gloves in the past. The hand compartment is comfy, but I can't make a good tight fist in either pair i have. I also really don't like how damn stiff the wrist cuff is and the glove does feel cumbersome. In fairness, they hold up real well!
Fairtex - Ehhh, good gear, but better brand and "hype" than pure quality. I do like them more than Twins and they are definitely quality. I have had both 10,12oz bag gloves and 14,16oz hook n loop sparing gloves, all decent, but not my favorite. Actually, my favorite pair of Fairtex gloves are the lace up mexican style gloves, 16oz..... they are really nice, got stolen out of my gym bag but till then i was using them a lot.
Windy- Personally, my favorite Thai gloves for a long time, like the fit and they hold up exceptionally well. I prefer the lace up's in 16oz, there a bit sleeker than the hook n loops. But Windy has always been my preference over either Fairtex or Twins.
All this said, Top King's gear is very nice, only had 1 pair of gloves but i have been very impressed. As for Raja, both myself and one of my buddies bought a pair about 4 months ago..... my opinion, they are garbage, based on the gloves we got (16oz)