Top fixtures are Claypaky Mythos 2s, Supersharpys or the Hepikos (though I'd be surprised if they choose to employ wash fixtures from two manufacturers). Bottom fixtures are Robe BMFL WashBeams. This is only based on what I see, so the the configuration on other towers may be different.
I'm glad you brought this up, but I dispute the notion that these towers are problematic. People should appreciate the level of quality and attention Disney puts into their shows. These World of Color towers aren't necessary, but Disney went out of their way to construct these very expensive show masts so that they could maintain sightlines during the day. No one else comes close to matching this level of commitment, and no guest or fan ever brings this up.
You can argue all you want about an attraction's creativity, but you cannot argue that Disney spends and continues to spend top dollar on most of their nighttime spectaculars. This level of technical creativity and know-how remains unmatched, yet is completely ignored when fans try to compare competing parks. It's a shame.