I've written Bada apps (CTO at a startup that's done quite a few of them), but personally can't compare directly to Android/iOS as I've not worked with those.
The toolkit is generally rough and you'll have to re-invent the wheel many times. You'll thank yourself for using a cross platform tool for anything but the most basic apps. One of our best selling apps on the Bada platform was made using FlashLite, and for games we've been using the Marmalade SDK (formerly Airplay, http://www.madewithmarmalade.com/)
The Wave I and Wave II are their most prominent offerings. They're pretty good on the hardware front. Personally I'd buy them without a thought if they ran Android.
The toolkit is generally rough and you'll have to re-invent the wheel many times. You'll thank yourself for using a cross platform tool for anything but the most basic apps. One of our best selling apps on the Bada platform was made using FlashLite, and for games we've been using the Marmalade SDK (formerly Airplay, http://www.madewithmarmalade.com/)