Gilmore is a more natural and would be better at FS, imo. Could see him having a Malcom Jenkins style transition to safety in the NFL.
Jeffery will be a good pro. He looks slow but still time after time gets behind defenses down the field. Just not many in the NFL or elsewhere with the size strength and hands combination. Would be well served to do some major conditioning work in the 3 months leading to the combine. If I were him I'd find out where Julio Jones worked out pre combine last year and get with that program.