Now with Runespan I'd put my vote into Runecrafting. It's not the fastest xp in the world, but there is literally zero requirements to get the best xp in game for it. There's the Runecrafting outfit from Great Orb Project, but it's been written off as not worth the time it takes to get the outfit so there's really nothing more to it than just going to Runespan and racking up xp.
There's nothing preventing you from making a new account and running straight to Runespan and getting 1-50 in a day, 1-99 in 2-3 weeks. No tools you need to acquire, no quests, no special boosts, just raw xp gains.
For 200m though I would probably put my money on Hunter, as painful as it would be. There's not really any requirements, and to get the 5% boost all you need to do is take a couple hours doing charm sprites, which are good xp anyway. Once you've got that done it's pretty much a straight shot to carpel tunnel and 200m at ~300k xp/hr.
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There's nothing preventing you from making a new account and running straight to Runespan and getting 1-50 in a day, 1-99 in 2-3 weeks. No tools you need to acquire, no quests, no special boosts, just raw xp gains.
For 200m though I would probably put my money on Hunter, as painful as it would be. There's not really any requirements, and to get the 5% boost all you need to do is take a couple hours doing charm sprites, which are good xp anyway. Once you've got that done it's pretty much a straight shot to carpel tunnel and 200m at ~300k xp/hr.