Pros and cons as you say. If you split it, the gap could be quite large coz of the weather, your availability and the examiners etc. Will you go 'off the boil' in the intervening period. Even if you stay 'topped up' by taking further practise lessons with your instructor, it will only last for so long.
If you weren't ready for your test the instructors wouldn't have put you in for it.
Personally, I'd rather do it in one go (and did) and get it over and done with. Sure, I was pretty knackered at the end of it, but the joy of passing meant that I wasn't too tired to celebrate.
Good luck.
C23