I personally think the funnest are Str/Mage but the best imo are Range/Mages. I have one right now I bot/play (sometimes) and it's pretty fast money in bh.
to be honest most 1 def pures fail now. Unless you make a good hybrid.. if not a hybrid then a rune pure.. but just a normal non hybrid 1 def pure is pointless. In otherwords. HYBRIDS FTW
The 3 best would have to be:
99 range
40 defence
99 mage
44 pray
87 cb or so, venge + cbow is rape.
Or a maxed 60 attack pure at 81 cb or so is good.
And assuming we're talking about best for combat, then 50 att 50 str and 70 range, 1 prayer, is beast, easy to make and for it's level rapes pvp.
Atm i'm going for a 99 range pure, already about half way there, I'll be 99 range at 71/72 combat, aswell as having ice blitz, so hopefully it will do well .
All pures are good and all have the goods/bads about them.
For example, 1 defence pures are level 85 maxed out, but a maxed out tank can attack them. Tanks have 99 defence and this makes the 1 def pure not able to hit while the tank is hitting constantly...
Also, at 1 defence you get koed by pjers a lot easier etc.
WEll , if you are looking to have fun, then either a hybrid or something around that. Looking for good loot or alot of kills, then either a tank or a barrows pure. ( personally i enjoy the fun in pking not the loot.)