I had very nice numbers with both advandia and actos. As far as I know, doctors like to put you on advandia before actos (I'm not sure why -- cost maybe?) -- I didn't have TOO much weight gain with either -- advandia was GREAT -- one pill before bed, however, it stopped working after a while and after my dosage was increased I gained a bit of weight and was constantly tired. So I was switched to Actos, and while my sugars were good, I gained more weight and was tired, so I was put on insulin.
There's also the price -- Actos is VERY expensive -- if you don't have a drug plan it's pretty much unaffordable. Most docs I know though, will give you samples of actos to try
Anyway, every body is different! I found I had loose bowels on metformin and it was very annoying! Give it a try -- actos and avandia are VERY convenient
Best of luck