I've got a garage full of Harbor Freight jacks, for cars and bikes. I've had only one started leaking hydraulic fluid after 20+yrs of use. Another one identical to it bought at the same times is still going strong. Here are my recommendations:
1. Get long-reach low-profile floor jack(s). They'll let you get into and under places otherwise not reachable. Unless you have HD trucks, the weight capacity (2-ton, 3-ton. etc.) isn't as important as the lifting height range. That said, the two specs tend to go hand-in-hand.
2. Two floor jacks are better than one; three are better than two. More allows you to work faster, smarter, and safer. Compare to what we spend on car/trucks, floor jacks are cheap.
3. When comparing floor jacks, pay attention to the details. They might all look the same, but the better ones will usually have better hardware. Things like a thread nut securing the rollers, instead of circlips. Greasable axle bearings instead of plain bushings. An extra $100 might seem like a lot for something that don't look all the different, but over a lifetime of use, the nicer tool makes it so much better to work with, time after time.