Wales 3 Iceland 1 a few years ago included one of the best individual performances I've seen in the flesh and it was topped off by a superb goal. The player in question? A certain Gareth Bale.
As far as a Giggs v Bale comparison goes, there is a fair bit of research in this piece
http://www.bbc.co.uk/sport/wales/42718816
which, to my mind, is written from a pro Giggs point of view.
I'd prefer to use a more basic means of measuring the two players' commitment to their country. In the case of Gareth Bale, his words and his actions show that playing for his country is very important to him (I'd say the same applied to David Beckham as well), but with Ryan Giggs, although there were plenty of fine words about how much playing for Wales meant to him, his actions over a lengthy period suggested otherwise - to not play a single friendly game for your country over a period of nearly a decade is a disgrace and distractions about
how many people were watching those matches do not make one iota of difference to that.