Best to talk to your FTO, so that they can make sure you do all the common modules and you are fully informed when you are doing modules which are PPL specific (such as instrument appreciation) so you can make a decision on which way to go. Early training will be the same for both anyway. Get a Class 2 medical - it will cover you for either.
My understanding is that in general the hours will count for either, but you aren't flying to complete x number of hours. You're learning to fly to be able to be a safe and competent pilot. If you aren't doing an intensive course, there is a good chance you wont be ready in the minimum hours of either course anyway.
I would decide which licence to get based on what you are wanting to do with the licence. Not how much training time is needed. If you run out of money to complete the course, you aren't likely to have the money to keep current anyway - but that's a different discussion.