Depends what you like. Many people like high PvP for the loots however, I make a ton of money on my obby mauler. I average almost 10 d bows an hour on my good days as well as some amulets of ranging and once in awhile some ranger boots. Almost everyone you fight is a ranger with low hp so 1-2 shotting them is quite easy. My obby mauler has these stats:
1 attack
99 strength
1 defence
60 hp
1 pray
50 range
55 mage
You basically want 55 magic for slayer staff, and the other stuff is self-explanitory. I prefer not to have prayer as it raises your combat level and only makes you hit 5 higher than you normally would. If you want to be truly maxed, you would want:
1 attack
99 strength
1 def
99 hp
1-31 pray (whichever you prefer)
61 range
61 mage
With 1 pray you would be 57 combat and probably be dealing with g maulers. If you really enjoy obby maulers you can even take it a step further and get summoning for a barker toad. Many people say obby maulers are boring but to me they are easy money makers and loads of fun. It's your opinion in the end, I just think there are way too many turmoil zerkers/pures around. Good luck with your choice
Edit: If you want an invincible account that is loads of fun you can always try a summoning tank. At maxed they are 99 Def, Hp, and 95-99 Summoning. However, these take loads of time to lootshare and you'd be spending 400+ hours just lootsharing charms which I would totally kill myself if I spent that much time doing the same thing legit on Runescape. You can bot it with Sprite hunter however I heard it is like 75 days worth of game-time botting but you also get something like 78m hunter exp for it.
