Most of the things he will be able to do I assume will be at MK.

Based on this, I'd vote for BLT hands down. You are going to need nap times and it is an easy walk from MK to BLT. It has a nice water play area for toddlers in the pool area.
Honestly, at 15 months he will be fine at any resort. I'd focus on what will be easiest/best for you.![]()

Honestly, at 15 months he will be fine at any resort. I'd focus on what will be easiest/best for you.![]()