I'm not that into FIM's songs. The only ones that stick out to me are Smile, Find a Way, and A True True Friend. By contrast, Equestria Girls has had some pretty solid songs throughout its lifetime. Here are 10 that stood out to me (it was difficult for me to narrow down to five, so I expanded the list to ten).

10.Life is a Runway — Rarity being inspirational while looking fabulous.
9. My Past is not Today — Sunset Shimmer sheds the last trace of her old self and becomes a new person.
8.So Much More To Me — Fluttershy being adorable for 2-3 minutes while singing a song that totally relatable to me.
7.Good Vibes — Just remember: just one small act of kindness can make a big difference.
6.I'm on a Yacht — It's a rap song sung by MLP characters; what more can I say?
5.Shake your Tail — Despite their differing interests, the Humane 6 find a way to band together to make something fun (wish they were this communicating in Rainbow Rocks).
4.Coinky-Dink World — It's basically a shipping song (I'm not kidding; watch the music video for this song).
3.The Other Side — Is it hot in here, or is it just me?
2.Cafeteria Song — It's an inspirational song rallying students to favor Twilight Sparkle over Sunset Shimmer. (It's also the first EQG song I ever heard)
1.Friendship Through the Ages — It wasn't intended to be, but I consider this to be FIM's post-mortem song (yes, moreso than the Magic of Friendship Grows). FIM may be gone, but the message it conveys never will be.

Honorable Mention: Five to Nine — Catchy song, but I don't know what to say about it other than that.

Here's a little fun fact: A True True Friend was not only the first FIM song I ever heard, but it's what introduced me to the series!

Disclaimer: This "top 10" image is my opinion, so you're free to agree or disagree with it.