Depends on how many devs they get on board and how long crapple lets their stuff get stagnant.
IOS really can’t multitask very well from what I hear, but there’s a ios7 update coming on the horizon that might change things. If not, WP8 might have a chance.
I’m still waiting for another WebOS phone, still miss my pre.
I cannot trust Microsoft because of the short lifetime of their applications, they never had a stable product that lives a long time. Just google list of the discontinued Microsoft product, even recently I got same problem with Google too (RIP Google Reader or Google Health).