Hmmm so far from what I’ve watched.
1. Yuru Yuri OP 1
2. Mitsudomoe OP 2 (the first one is just as good though)
3. Mirai Nikki OP 1
4. Nichijou OP 2 (I like OP 1 too, but I’m one of the Nichijou fans who likes the second better)
5. Toradora OP 1 (one of my faves, it doesn’t matter that I put it 5th)
I’m too lazy to find out/remember the real names of the songs LOL. Some openings I REALLY like the visuals for, but the music isn’t my fave so I can’t really call them top.