Best spill proof sippy cups?

I have one that I like for my older dude but my younger (2) is tricky. We tried the contigo flip straw cups and he bit through the silicone part. I found the modern summit kids sippy and thought I loved it but it is tricky to use which I didn’t mind but noticed mold in the tiny crevices that I thought were not a thing for us but they are hard to see into and I looked close and sure enough despite my obsessive washing there is mold in the crevices and they are impossible to clean. So now back on the hunt. It has to have a hard spout because he bites at it and ruins the soft ones.

TIA