Ask if there are any service record history available. The one that has the oil, coolant, transmission fluids, gear oil, brake fluid and power steering fluid changed on schedule is the one that will most likely give you the least amount of issues. You can look at the Carfax data for each of them which may offer at least some amount of insight into the service frequency. If there is a extensive amount of carfax data, copy and paste it into AI for an analysis.
Owners who are serious about the maintenance schedule tend keep records and receipts, whether they DIY or have it done at a shop. If they have nothing in that department, I'd be hesitant. When you get deep into mileage, those consistent fluid changes matter more. I'd absolutely take 200k with oil changes every 5k/6 months like clockwork over 150k with a spotty oil change history. A bit of a unicorn, but if it had "break in" period oil changes performed at 500, 1000 and 1500 miles, you up your reliability for super high mileage noticeably.
