Just popping out - but i'll reply a bit more later..
I have the 330 frame and i've recently built a 450. Initial thoughts / feelings is that i prefer the 330 as it's super agile and a blast to fly. The 450 feels a bit 'big' and cumbersome in comparison.
I bought the 450 to carry a camera though - if it's just to fly and I had to keep one, currently it would be the 330 - cheaper too....
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