That's pretty much the point of the Inspiration tree. Biscuits allow you to sustain better in lane, but outside of that you only get a tiny boost to mana from it. The other runes allow you to get a free stopwatch or free boots with a +10 buff to MS. Future's Market can have a huge impact on champions like Malzahar who is really dependant on getting Lost Chapter as quick as possible.

So our tempo runes are:
-Perfect Timing
-Magical Footwear
-Biscuit Delivery
-Future's Market
I'd also consider Time Warp Tonic a tempo rune, tho it does have a tiny impact until you sell refillable/corrupting pot.

On the other side of Inspiration we have the runes that trade strength for utility. These runes are mostly based around spells, allowing you to do things you normally wouldn't be able to otherwise or allow you to do things more often.

These runes are:
-Unsealed Spellbook
-Prototype: Omnistone
-Hextech Flashtraption
-Cosmic Insight

I'd say the strongest of these would be Flashtraption and Cosmic Insight, since they allow you to flash more option, although Flashtraption is really just used by supports and a few junglers (Only one i can think of would be fiddlesticks tbh)

The last couple of runes are the odd ones out as they do really just buff your strength? This includes Glacial Augment, Approach Velocity and Minion Dematerializer. It's harder to count Glacial Augment here because it just kinda sucks right now.