My preferred, and what I personally think is fairest, is B2P, with a cosmetic cash-shop available. The upfront cost pays for original developement, and the cash shop helps fund content patchs/expansions.
In my opinion, the best pricing is mixed all options. You should have a choice if you want to buy to play, use microtransactions, or monthly subscription.
Microtransaction could be F2P with low level cap. If you buy something from item shop level cap increases. If you buy items from item shop and spend as muchmoney as if you would pay for it in B2P model, the level cap would be removed. On B2P model the level cap could be removed from the start and you would be given virtual currency which would be spend on item shop. So F2P and B2P would be pretty the same thing, the difference is that in F2P you could test a game for free. Monthly subscription would be the same as B2P, it's like buying a currency for item shop every month. For subscription could have more benefits, like lower prices in IS.
Comments
Microtransaction could be F2P with low level cap. If you buy something from item shop level cap increases. If you buy items from item shop and spend as muchmoney as if you would pay for it in B2P model, the level cap would be removed.
On B2P model the level cap could be removed from the start and you would be given virtual currency which would be spend on item shop. So F2P and B2P would be pretty the same thing, the difference is that in F2P you could test a game for free.
Monthly subscription would be the same as B2P, it's like buying a currency for item shop every month. For subscription could have more benefits, like lower prices in IS.