If it were me - I'd keep the 10 acres. There's so much you can do with 10 acres that you cannot do with 1. 10 acres is enough land to have an orchard, a small pasture field to raise a few head of beef, a couple sheep, a couple goats - and you'd have enough space for a pig lot if you were up to raising a couple pigs for slaughter. If you wanted free ranged poultry, 10 acres gives a lot more space for that as well.
On the other hand, on 1 acre you can still have a chicken yard, garden, small orchard, raise rabbits, keep bees, use 1/2 the acre for a milk or a couple sheep, and I'm sure there's more. I just can't think right now.
So it's really a matter of what do you want to be able to do with the land if you should come back?
We thought we were farming just over 7 acres here, but when they did our survey a couple years ago and measured it all out, turns out we have 9 acres. We are raising chickens, ducks, geese, turkeys, 2 rabbits, and 4 cattle on our 9 acres - not counting the 2 acres we've acquired across the road. I'm working on adding a goat, and I'm hopeful to eventually add bees.
So I'd really sit down and discuss with your DH about what you'd want to use the land for if you did come back, and what scale would you want to do it at?