I wouldn't say the larger pump would be more efficient, in my experience smaller pumps have higher air to water ratios. I believe this is partially why larger skimmers tend to use multiple smaller pumps rather than one bigger pump. Of course the the larger pump will bring in more air but uses more power, so you can't make any claims about efficiency without at least knowing the air flow and power consumption of the pump.
Personally I would probably go with the 80, it's smaller which would probably be better considering space may be a concern with a 33 gallon aquarium and because I've seen a few 100s and 135s have problems containing air bubbles, again a big concern if a small sump is being used. Going bigger isn't always better, the larger pump on the 100 will likely cause more turbulence in the small body and since euro-reefs don't have diffuser plates it may not be as effective at skimming less stable proteins.
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