What were Ronald Reagan's accomplishments?
Successful 2 term governor of the most populous state in America?
How different is that from being a two term senator of New York?
Seriously, you can't really even compare the two. It would be like comparing a CEO (governor) to a sales manager (senator). Sales manager probably has more responsibilities than a senator, so probably not the best example.
Being governor of a state, especially of a populous state, is far more important, and far better experience for POTUS, than being 1 out of 100 votes in the Senate. It's not really even close. As governor, not only are you the head of the executive branch, you also have to make hard decisions like balancing a budget. How many balanced budgets (or budgets at all, for that matter) have come out of the Senate recently?
In terms of getting elected as an accomplishment, I would also give Ronnie the edge there. He won in CA as a Republican. Of course, those were different times back then and he was at least a semi-famous b movie actor, but Hillary's path to that Senate seat was gold paved.