there is no best type.
Ive only been playing 2 months and have yet to play a large scale scenario game, will try at pork "sword in the rig" at wakefield in sept.
I like the idea of having a large area to cover with objectives, but i dont like all the fake "i know someone in the" army nerds trying to do military tactics and use jargon as if they had ever taken a tour.
I played a couple of speedball games and really like the fast pace, i dont like playing non stop. Speedball games with regular breaks and pissing about on the sidelines is a lot of fun, just try no to shout to warn your mates on the field they are about to be mugged, thats like 'table talk' in a card game.
hope it helps, play both, enjoy all facets of the sport.