Cal may have been a better shortstop - that is subjective. He had 2 gold gloves, Jeter had 5
In 21 years Cal had 3184 hits (#15 all time) to Jeter's 3463 (so far) (#6 all time). Jeter's hits are the all-time best for a shortstop.
Cal batted .276 for his career (#764 all time) to Jeter's .309 (#114 all time).
Cal had 1 World Series championship, 2 league MVPs, 19 All Star appearances and 2 All Star MVPs.
Derek had 5 WS championships, 1 league MVP, 1 World Series MVP, 14 All Star appearances, 1 All Star MVP.
Both clearly belong in the HOF. Nobody is ever going to get in unanimously on the first ballot because some writers don't think anyone should, and won't vote for anyone their first year.