As with the previous polls, we're just looking at toys from your childhood; which one was the one that you loved the most as a kid? And we're only looking at the original G1 Dinobots.
My favourite was (and is) Snarl. Aside from being my first* Dinobot, I love the mould and design, and I really love the canonical fact that his strength tenfolds in sunlight and he can still store solar energy after dark, maintaining a high level of super strength. So considering that his base Strength is 9, it means that on a sunny day it can reach up to 90! He's kinda like a Kryptonian -- his solar cells drink the energies of Earth's sun and powers him up, even when it's dark. Much like a Kryptonian, Snarl would need to go for an extended period of time without sunlight for him to lose this boosted power, but even then, he would drop down to his minimum Strength rating of 9, which is still really freakin' strong! (unlike a Kryptonian who I think would become substantially weakened).
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*My G1 Grimlock was acquired on the same day, but initially belonged to my brother, so Snarl technically counts as my first Dinobot (even though we opened both at the same time )