In reply to Suncream:
Flip a coin, they're both great!
I guess Pembroke is more 'compact' (but still huge!) and you could get a lot of mileage in if you stayed at Range East/Bosherton area. If you're climbing E1 or above, there are endless quality lines to go at. Generally quick drying, but can be soapy early in the day. I don't think grades are particularly soft (but then I'm shit!).
Cornwall you'll have to travel a bit more between crags, but means there are more options on direction/condition). There are loads of classics below HVS. Some crags can seep a bit, but not slow to dry if you have a breeze. Plus there are pasties.
Not sure what forecast is like next week, but it is sodden in Devon/Cornwall ATM.......next week could be more of the same wherever you go?