It can get cold in your part of the world ,so you may want to try to stay dry. For that I think the sit in style is more effective than the sit on.
Assuming you are going to store the boats on board, you will need to work out a system that allows you to launch and retrieve the kayaks easily.Where you store them may limit the length.
The pic's shows what works for us. Note, our units are sit ons, which is fine for us as we live in a warm climate, and we are usually in swimmers so getting wet is not an issue.
These boats are made from Polyethylene, very tough and quite lite.They are 10' long and fairly broad, which makes for good stability.They point reasonably well, good for small adventures not really up to long trips though.
All things considered they are a lot of fun, and importantly, easy for single handed launch and retrieval.