snes mouse for me, by the time that we got a computer, it was already the point where optical mice were coming out so before gunk on the rollers was ever a problem, we got an intellimouse 3, and this mouse lasted till laser mice was common. still had a second cheap optical mouse just because lasers while common, where still that higher price point.
and just in case anyone needs a new mouse on a budget, cheap optical mice are better than cheap laser mice. lasers are very accurate, but that is also a problem because a left click on a cheap laser can send the mouse off 20~ pixels, while a cheap optical doesnt have this issue at all. cheap opticals also don't tend to have sensor issues the same way that cheap lasers do.