Which party would theoretically benefit more from 100% turnout / mandatory voting?

[IceAgeComing]

and a large chunk of that 8% will either be people that planned to vote on the day but had a legitimate reason not to (things like a sudden medical emergency preventing you from planning an alternative way to vote) or people still listed on the electoral roll that can't vote: people who've died in the time between the roll being last updated and the election, or people that have moved away but are still registered at their old address.  A true 100% turnout isn't really possible: an official 92% turnout is in reality probably a percent or two higher than that.