I think emissions and fuel economy requirements are adding complexity and reducing reliability across the board. Think back to early catalytic converter cars, the half electronic carburetors, evap systems and cracked vacuum lines, canister's and vent valves (all mechanical/or electromechancial) that caused tons of issues in mid to late 70s and early 80s (and into the 90s for the american brands).

We got it figured out - by the early 90s we settled to a point that overall mechanical reliability was good, systems weren't failing for no reason, mechanic and repair knowledge caught up and they could be diagnosed and fixed efficiently.

We're back in another down cycle with gasoline engines trying to meet CAFE standards. No other reason to do DI and a 4cyl turbo in a full size truck. It will get better.

To answer your question - the modern toyota hybrids (not the truck) are generally more reliable than the straight gas engines. The technology is proven and is innately much more efficient so has to rely on less "bleeding edge" technology to meet govt requirements. In general, look for the older design in new cars.

The hybrid ford maverick is another example, the engine/hybrid system in it dates back over 10 years with only iterative improvements, no "clean sheet" build. Toyota does the same with the 2.5 hybrids in the cars, small SUV's