Surprisingly Adam hasn't asked your location.
Poly main advantage is thermal efficiency which is handy if you're in the North
(although checking temps periodically I've noticed there's little variance between here on the Welsh border and York).
You're going to get one anyway but If you're not in sub zero climate for half the year then is it worth it?
I run poly nucs and timber hives (which can be retro insulated anyway)
I have found durability isn't quite so good as with timber and others have found several poly brands have design deficiency allowing water in amongst other problems so it's a bit of a Pandoras box.
I got a Paradise hive from Currys -really heavy to move until I found some joker had hidden a washing machine inside it.
(Sorry but that's what they look like)
Plus there's the cleaning and sterilizing -much easier with wooden boxes.
I have a Steele and Brodie that was made at least 70 years ago, a couple of Maisemores of unknown vintage and another half a dozen I've made myself over the last few years.
All components are
fully interchangeable.
You would struggle to achieve that with Poly so make sure you pick the winner first time!!
Oh and woody woodpecker prefers Polystyrene over timber-much quicker