Should I get a 50cc or a 125cc bike?

I'm 17 and need some transport on a budget - I'll be commuting in and around towns, for about 60-80 miles per week. I'm aware of the speed differences between the 50cc and 125cc, but will it be a big factor if I avoid motorways?

Also, does anyone have any advice on models? I obviously want to avoid cheap Chinese copies, but it's hard to find reviews for 50cc bikes:(

And then the Honda CB125 seemed good in terms of the 125ccs… Thoughts?

Thanks!

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