1 is the better SS; he has done exactly what I would expect, which is have a solid number of (+) plays (glove and AS both slightly above recommended) and a lousy fielding percentage (glove well below recommended). He's a touch below average, since he's +6 but has made about 12 more errors than an average SS would. I'd take that defense with that bat.
2 has also done exactly what I would expect, which is to have the same fielding pct as (1) (because their glove + AA is about the same) but be ever so slightly (-) in +/- (range slightly above expected, AS slightly below). I bet if you read play-by-play you'd find 2's errors were more damaging, because a bobble is almost always a one-base error but a wild throw is often a 2-base error.
1 at short, 2 at 2B/3B, and the overall quality of play at both positions is outstanding given the bats in question. Since (1) has only 70 DUR, (2) can be his backup, although I'd carry a defensive SS on this team to give (1) some innings off in close wins or blowouts.
Also, I'm not sure what possessed you to send (2) to the minors this season.