All of the above, for both public flagship kid and for LAC kid, though some topics were more relevant for one than for the other.
Flagship kid looked at major requirements for areas of interest, wasn’t worried about admission to major as a humanities/social sciences kid, did consider gen eds and came to regret not self studying for some science APs based on his IB curriculum in order to knock off the 12 credit requirement (ugh). Class size wasn’t much of a factor since he knew the ranges, though being in Honors offered the option of taking large courses for Honors credit which meant weekly discussion section was led by the professor rather than TA – used strategically for areas of interest.
LAC kid looked generally at major requirements for areas of interest, also didn’t consider admission to major as a LAC kid. Looked very closely at gen ed requirements and I, personally, found the differences fascinating – comparing Grinnell’s open curriculum with limits on the maximum number of credits from a department and field so that students can’t take only classes in one or two related departments and explore nothing else over 4 years; Bates’ requirement of a minor or cluster of courses in addition to a major; Kenyon’s requirement that students take their distribution requirements (such as sciences) from the same department, so the idea is depth within the distribution requirement; and Denison’s requirement that the 2 courses in the distribution requirement (such as sciences) must be from different departments so the idea is exposure to more areas of inquiry. Class size was important – it mattered whether classes were capped in the 20 range or whether popular Intro classes drifted up into the 40s.