Pent roofs concentrate the fall in one direction and can help a building stay below a tight overall-height limit. Apex roofs create height along a ridge and often feel more balanced inside. Neither form is automatically drier or stronger without the rest of the specification.
Put the low and wet edges on the plan
On a pent roof, note which side receives runoff and where guttering can discharge. Check headroom at the low wall. On an apex roof, confirm the ridge orientation and both eaves clearances.
Compare like with like
Look at roof covering, deck or boarding, framing, eaves detail and stated overall height. Planning limits use actual dimensions, not the roof category name.