In UK or Philippines best to marry?

Purely through the act of marriage no, she doesn't lose any of her citizens' rights. However, as OFWs will confirm, working and living abroad does affect their ability to purchase/own real property - there is a strict restriction on land area that affects OFWs. Losing citizenship - such as when becoming a British citizen - automatically loses her the ability to own real property; but citizenship can be re-instated at the Philippine Embassy. For a fee.

She is a Filipino citizen so she won't lose the right to buy property, indeed she won't lose any rights unless she gives up her citizenship

Mark, I don't suppose you know what the actual land area is do you?

Hi This site may be helpful: http://philpad.com/can-a-foreigner-buy-a-condo-in-the-philippines/ The reference is condo, but some links for land and other property purchases

Hi Mark thank you for your reply... Just to confirm: by marrying in the UK a Filipino does not lose any citizen rights in the Philippines because marriage per se is not related to the definition of 'citizen', but, should a Philipino reside in the UK for x number of years they lose some of their Philippine citizen rights by way of the rules related to a OFW by the Philippine govt? Also, how does a Philippino wife, married and residing in the UK, become a British citizen? By becoming a British citizen would she lose her citizenship in the Philippines?

I can't remember the exact figure but the land area is just about sufficient to build a small house; 150 sq.metres rings a bell.

That is correct. A foreign-born national can apply to be naturalised as a British citizen after (I believe) five years of residency. There is no concept of dual citizenship in the Philippines.

She will still be a Philippine citizen so there shouldn't be a problem. When she settles in the UK she can become a British citizen in five years, then she can apply for dual citizenship if she likes.