Neither one has a lot of new parts available. So, either way if you need something, you have to scrounge a bit.
I've got a 1010 crawler-loader and love it. It's a first-year 1960 model.
I also had a TD14 and hated it. Mostly because of the hand-clutch which is a pain to use when running a loader. Also - used parts were much harder to find in my area. That being said - I still have an Allis Chalmers HD6 with hand-clutch and I like it. But - it's dozer, not a loader and used parts are more plentiful also.
As I see it - $2000 for a running 1010 crawler loader is a good deal. Running is no guarantee that it won't fall apart a week after you buy and need $1000s in repairs - but that goes with ANY used machine.
I worked on 1010s when new. I cannot name any major design problems with the 1010 gas-engine crawlers. In some ways they were more durable then the larger 350s that followed.
Other poeple on this site will tell you the 1010 as a disaster for Deere. All I can tell you is - ask anyone who tells you that exactly what those so-called design problems are.
My only complaint with the 1010 is lack of aftermarket parts support for the engine series. Many parts must come directly from Deere Co. But - fix an engine correctly once - and I doubt you'll ever have to do it again. That is, unless this is an all day, every day, all year - use machine.