For practical purposes it's a draw but if the economic recovery continues it's usually the presidents party that gets the windfall. Ask the 1980s dems how much the reagan years helped them haha.
Actually the Reagan years were more mixed in terms of partisan power.
The Republicans did hold the Senate for six years, but the Democrats consistently had 55% or more power in the US House from 1981-1989.
However, it should be noted that back then there were a lot more Blue Dogs in Congress than there are today, which is why Reagan was successful in pushing his agenda through Congress despite Democratic majorities in either/both house of Congress during his presidency. Technically, the most Republican years in the 80's were Reagan's first two as President (which is probably true for a lot of Presidents) which are generally regarded as his "meh" term.