It's hard to believe no one's pointed out the elephant in the room yet.. so I'll pull his trunk a little.
The L3800, like every "economy" L series Kubota built in the last 5-7 years has an excellent chance of having a rough 3 point hitch that jumps an inch every time you try to raise it a fraction of that amount.
I've put up with that for almost 3 years, and while it looks as if we may have the problem licked finally, it shouldn't have been there in the first place.
You may have a battle on your hands getting your dealer to address it if the one you buy has the problem with the hitch jerking. Some call it warranty work, others refuse to even acknowledge the problem. It's one of the things you have to compare during the test drives. Ask both dealers to hook a box blade on the hitch, and try raising it slowly, a little at a time.
If it jumps, and the dealer assures you that "We'll get that fixed for you once you sign the papers.." I would strongly suggest he stick his papers where the sun don't shine and fix the problem first, then we'll talk.
That being said, I think the Kubota has the edge in value and usability, but Deere makes a good product and generally stands behind them.
If they're both smooth and you can live with them, then it comes down to which tractor you like the best, and which dealer gives you the best feeling for the service you'll get after the sale.
That's my 2 cents and then some.
Sean