Phrases such as "two times bigger", while no doubt commonly used, are illogical and/or ambiguous. "two times as big" or "twice as big" is correct, but following this with "compared to" doesn't seem right. ", but one would need to see the continuation too.
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Newguesttwo times bigger compared toInstead of the quoted part above, in this context, I'd write twice as big as, without 'compared to'.