My personal opinion...if you want something reliable, avoid the 70s, 80s, and 90s passenger vehicles (trucks and Jeeps somewhat excluded). Electronics, electrical, emission, and engine control systems were still on a steep learning curve. Light duty trucks had not adopted heavy duty design, automatic transmissions were crap, and the suspensions either sucked from the factory, or are completely ragged out now. Most anything you buy from that era will need a $1-2k a year to keep it running, plus the cost of your time for upkeep. There are exceptions to all of these things of course, and trucks and some SUVs maintained a level of simplicity for much longer.
But for the sake of reliability it's hard to beat something late 2000s and newer, or something from the 60s or 70s with a manual transmission.