Hi there, :)
I am looking to buy a vibrator for my wife. I want it to be a surprise so I cant discuss this with her really .
But what I would like to know is which do women prefer; Clitoral stimulation or G spot stimulation?
Just like men, women all like different things and sensations. Whilst some prefer clitoral stimulation, other's may prefer G-spot stimulation, and other's may prefer both at the same time - every woman is different. If you don't know what your wife prefers you could try subtly asking her during foreplay or sex.
Also; which is most likely to make a woman orgasm and which will make a woman squirt?
Women are more likely to orgasm through clitoral stimulation - most of us actually need this to orgasm, however some women can orgasm just from G-spot / internal stimulation alone but I don't think this is as common. Regarding squirting, not all of us are able to squirt. G-spot stimulation is more likely to make women squirt, however some can squirt from clitoral stimulation once they've learnt how to acheive squirting. This may be of some use on how to squirt: http://www.lovehoney.co.uk/blog/2007/09/06/female-ejaculation-how-to-squirt/.
Which gives a woman the most pleasure.
Again, as I said before, all of us are different and what I may find the most pleasurable, someone else may not and may find the complete opposite gives them more pleasure. The best thing to do would be to communicate to your wife whilst in the bedroom and to watch and listen to how her body reacts when you do certain things to her.
Which vibrators would any members recommend and for which type of stimulation?
The Lovehoney Deluxe Magic Wand is a favourite for loads of people here, I don't have it but everyone makes me wish I do! haha. It can be used for clitoral stimulation or massages so is a great multi-purpose toy. There is the original wand at £49.99 http://www.lovehoney.co.uk/product.cfm?p=20464 or you can get the newer purple wand, storage bag, and G-spot attatchment for £74.99 http://www.lovehoney.co.uk/product.cfm?p=28707 plus you get a Sqweel 2 with it absolutely free making this pack much better value! And you're getting the best of both - a toy for both clitoral and G-spot stimulation.