In a general sense. I would Suggest friends. bcz you feel confidence, open and will do whatever without the thoughts of anyone's judgement. traveling with soulmate is more than travelling with baby sitter or bodyguard or care taker. it's natural. They won't allow you to take risky adventures so that your family.
These are the best Companions ever for a good trip. It's all depend on the destination.If I want to pick one, with best friends is the best trip ever,where we can enjoy a lot.