Servicepals gets my vote, hence the free plug, and I would be pleased to see it grow. It's simply down to the personalities involved. Servicepals was given a big boost a couple of years back by an ex Army webmaster who I have a lot of time for. It has since had a part change of ownership and it'll be interesting to see where it goes next.
I would be interested in opinions about forcesreunited from those who've come in contact with the owner and organisation.