From what I have read...d1 NCAA men’s baseball is about equal to AA minor league ball at this time...maybe AA+...unless a player is a blue chipper out of high school and is a sure thing to get to MLB...considering the very low pay one gets in minor league a free 4 year ride at a college would be a better proposition assuming one gets a education that can be used after baseball. Then, if drafted the college player still has to climb the tough ziggurat to MLB. Minor league players play more often college players so have more experience..
A top 100 drafted player will get $750k to $10.5 million. A 10th rounder is still $175k+. These days, most draftees have some college already.
Probably only top 50 are guaranteed a look in the majors, and a lot of them won’t stick around. But there a usually a couple hundred rookies that get an MLB look every year. MLB minimum is $740k, which is a nice check even prorated to 2 weeks.