well. I'm a Case and OLiver fan so... It depends on what you're going to use it for since they are both good tractors and if taken care should give lots of service.
For general farming like some row crops and hay i would maybe look at the 1850 Olie as it may handle a bit better. if the oliver has Over/Under hydro drive that would be handy to have as well. The Case 930 can be a chore tractor too.. many are used in that capacity.
for brute force brunt work the Case long stroke engine can pull. The Case is probably a bit heavier than the Oliver too for heavy work.
They made alot of both models so Parts should be "easy" to find new or used but new are probably getting harder to find for both. Case still exists but they've cut back on alot of older parts.
the Perkins in the Oliver maybe be easier to get parts for as well since that engine was used in several applications and may also be available from Perkins too.
like others have said they are both OVER 50 years old now. try to get history, test drive look them over. when I've bought Cases in the past i've cracked the drain pan to look for antifreeze due to leaking sleeves. This is NOT a common problem but i have seen it. of course Not every seller would want you to do that either.
Ideally someone on here that owns both would chime in (i'm SURE there are a couple).
of course $$ is the other factor. so look at condition, tires, price and what you need it for and go from there.
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