Pussy pumps! Which ones better for me?

Ive got it down to 2 choices

http://www.lovehoney.co.uk/product.cfm?p=15121 doc Johnson pussy pump pink

Or

http://www.lovehoney.co.uk/product.cfm?p=22074 doc johnson extra large pussy pump

I'm a larger girl, but does that make any difference? I've never used one but looks interesting.??

i have the doc johnson pussy pump and im a size 10 its prob the best to get for a beginner i mistakenly bought large pussy pump from bandana ( i was a novice and unaware of lovehoney) i was so disappointed with it you have to make sure you have no gaps or it wont suck and it was way to big which ever way i tried it ! the doc johnson pump will fit and give good suction the only thing i would change is the colour to a clear cup so u can see better!!

I don't know if this helps but I have written a pussy pump guide and it includes info about sizing:

http://grittywoman.co.uk/2013/03/beginners-guide-to-using-pussy-pumps.html

I would recommend the Doc Johnson one. I own 3 pussy pumps, one large, one petite and the Doc Johnson and I am a size 12/14 and have what I imagine to be an average vagina in size and shape. I honestly cannot say if the large would suit you more but what I would say is to take into account how plump your vaginal lips and pubic mound are, as if you have a very full vagina you may need a larger cup, however you also want to avoid getting a large cup that is too long. (I explain all this in my guide) I would still recommend the Doc Johnson for you, but again, I cannot be sure as we all have different sized and shaped lady bits.

Thanks for the link Fluffbags, very useful