I approve of the fearless use of the admittedly cheesy "love languages".

I skimmed the categories and don't see any relevant difference between gifts and service.

I'd also rather think about love acts as providing evidence that either:

1) My partner is able and willing to please me.

2) My partner values me so greatly that I'm unafraid of abandonment for a more desirable alternative.

With 1), I much prefer if she enjoys something for her own sake that just happens to please me (because it adds to my security as well). But I'm also especially pleased if I know she values the act much more highly because she intends to make me value her. Or maybe I'm so secure that I would say, "I'm already convinced - let's do something we both value for something other than a token of our love."

I'd guess that most people want as much as possible of both. It is possible that people can be classified into a few simple types per what "love language" most effectively achieves these ends in them.