Animal Parade and Tree of Tranquility have been better than... well the other more recent games (Magical Melody, A Wonderful Life). Nothing has matched BTN/64. But they're both still good games. But both have the same characters. So unless you are a HM Fanatic, you probably want to pick just one.
I'd recommend Animal Parade personally. Neither have great festivals (sadly all the best festivals have been used up a long time ago). It's a bit more challenging, and I think it starts out a bit faster too. There's a little more to do in it as well.
The only real downside to Animal Parade I think is that you can only have 3 types of animals in your barn. While in Tree of Tranquility, you can have all types of animals in your farm. Oh and time moves a little too slow in Animal Parade.
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See You In Another Life, Brother.