well it's hotter than Hades in Houston, (I'd imagine if I were in Maine, I'd not want to be putting cold metal to my moist lips or we'd have a "Flick tongue on the flagpole" situation *lol*) I have several of plastic, glass, and metal and there's not much difference honestly.
I like the mflux metal wide bore ones (de ja vu, I thought I posted a pic of them yesterday on a thread)
I've tried those long curvy ones, it's supposed to deliver a cooler inhale, and it was, but it was negligible for me
it's like so much of vape gear, it's totally subjective. Yah like what you like!