I'd agree, i doubt its because Kingsford is better than Loirston. The club themselves clearly preferred Loirston as it was their first choice all along, Kingsford only became an option after Loirston rather dramatically fell through.
(However, before 100%AK jumps on this, the club has also made pretty clear that in their view Loirston is no longer an option, and Kings Links/Pittodrie were non-starters. So the merits and issues with Kingsford are what we examine now, and try to resolve if possible).
In terms of increased support:
You could maybe argue that there's an element of fans realising that options are always going to be more limited than they would like, and are tempering their objections accordingly.
You could equally argue an element of fans getting fed up with the length of the process, and just want it concluded.
Or, as i mentioned, that the volume seems to have gone up in the debate, making it more polarised and both sides more obvious.
It does seem unlikely that the increased support is due to it being a better option though.
edit - ach, you've both just posted pretty much the same as i was typing this