You did ask what we liked the most!
While giant reptiles are cool (dinosaurs and Godzilla, mate!), giant insects are terrifying (and don't get me started on giant arachnids) for multiple reasons: fast-breeding, nasty attacks, swarm behavior, strength-to-body-mass ratio and so on and so on...
But that's assuming you do away with the square-cube law: if the length of something three-dimensional goes up by x, the surface goes up by x² and the volume by x³. That's the basic reason giant insects don't exist: they would collapse under their own mass (function of volume so going up at cube) or not manage to pump blood (technically lymph) to their extremities and suffocate.
But there's fossils of giant dragonflies the size of a golden retriever big rat (30cm, or a foot long)! Yes, my friend, there are, and they're awesome. But they're also from a time period with a much higher oxygen content in the atmosphere, which meant a lot less effort to breathe. Bring one back from the dead today and it'll suffocate back to death quickly.
So, depending on the fantasy-ness of your universe, you can bring out the big creepy-crawlies, they won't creep much nor crawl for long!
Edit: overestimated Meganeura's and Meganeuropsis' sizes!