In my OP, the score received when the player got the 2048 tile was 20,392. Our first finisher was psychotic with a score of 21,052. This means to me that the scores can differ from player to player.

I'm gonna stick towards "Highest Score wins". It encourages risky play by elongating the game. I want to see someone with 2x FFX ready to match, and then losing. The tears will be delicious if it happens.

I do encourage all scores to be posted though. I'll update the OP with current scores just now. A lot of entries this month which I'm quite happy about.