Need some advice

I'm looking to buy a new frame and I've found 2...
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...so I need some advice on which one to buy??**
I don't really know much about this sorta thing.

They look to be different sizes. Buy the one that fits.

also, very different sizes as has been said, find out your size first , before you buy anything

How tall are you?

It sounds as if you don't know what size frame you need.

If you search there's a list of bike fitting services and in there is a link to a free online measuring guide.

You should always find the top tube length and use that as the basis for your choice.