Hi All- need some advice please.

I am moving next week from Toronto to Miami Florida.
Currently an E50k with Air Canada. When flying within the US I have obviously always used United to help earn status miles. I have never been unhappy with their service and like the perks of free economy plus etc. Food is not up to par of AC but I dont think any of the American carriers are.

Some of my colleagues who also travel a lot, some more than me, say I should switch to OneWorld and AA. I know Miami is a hub for AA but just have never liked their product the few times I have flow (Wow- those MD 80's no comment).

Will be travelling to the following this year (RT);
US-8 domestic flights
Canada- 2
UK- 1 (biz)
UAE- 1 (biz)
Russia- 1 (biz)
Brazil/ Argentina- 1 (biz)
China- 1 (biz)

Would AA status match? I know United prob wont because it is also *A.

Any suggestions or comments would be appreciated. Shame I am going to lose 20 credits with AC but oh well.