The are two completely different boards, it all depends on the rest of your components to what one will suit you the most.

Asus Z97-A: ATX, supports overclocking, supports SLI & XFire, more expensive

ASRock H97M: mATX, doesn't support overclocking, doesn't support SLI, supports XFire, cheaper

I would not get either, what is your budget and list of other components?

JaffaCakeNotBiscuit wrote The are two completely different boards, it all depends on the rest of your components to what one will suit you the most.

Asus Z97-A: ATX, supports overclocking, supports SLI & XFire, more expensive

ASRock H97M: mATX, doesn't support overclocking, doesn't support SLI, supports XFire, cheaper

I would not get either, what is your budget and list of other components?

This is my list atm
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What is your total budget for everything? There's a few things I would change about that build.

Around £700 would be good i dont mind if it goes over or under.

Seeing as your build was ~£750 without a motherboard I think £800 with a board and better quality components is feasible. Both include a good 1080p monitor.

Option 1; SLI support, strong GPU, no SSD
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Option 2; Crossfire support, weaker GPU, 250GB SSD
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I'd definitely go with the first build, an SSD is a luxury, it is very nice to have but trust me you don't want to sacrifice gaming performance for something you can add in a month or so later.