RTwP allows misses more effectively than TB in my opinion! Which is more to the D&D rules where misses are quite common in the earlier levels.
You can fire off a few initial spells, and instead of having to do something every turn, you can just watch it happen for a bit... Easy fights are easy without needing to pause.
TB slows the game quite a bit, and if it is a game without cooldowns or without a lot of special attacks (ie. a lot of white attacks), then RTwP is much better. You can allow some party members just do their thing under their AI direction without having to worry. TB slows all that down.
The focus should be on the role play, not the combat and RTwP allows that focus to be where it should be..... IMO lol