An automatic gate is the rare upgrade you use every single day, which is exactly why a mismatched one becomes such an aggravation. Most of the problems are decided before anything is installed.
Start with the gate itself, not the opener. Operators are rated for a maximum weight and length, and running one near the top of its rating on a heavy gate is how you burn through it in a couple of years. It also has to be a gate that swings or slides freely by hand. An operator does not fix a gate that drags, binds, or has a sagging hinge post. It just breaks faster while forcing it.
Then look at the ground. A swing gate needs a clear arc with enough level space through the full travel, which rules it out on drives that slope up from the street. A slide gate needs run-out room alongside the opening for the gate to retract into. Cantilever slides need the most room but touch nothing at ground level, which makes them the right call where a track would fill with mud and debris.
Power is the next question. A hardwired 120V circuit at the gate is the most reliable option if the trench is reasonable. Solar is genuinely good on a long drive where trenching would cost more than the operator, as long as the panel gets real sun and the cycle count is modest. Either way, insist on battery backup. Houston loses power, and being stuck outside your own gate in a storm is the moment people decide they hate their gate.
Safety devices are not optional. A gate has enough force to seriously injure someone, and a proper install includes photo eyes across the opening, safety loops that stop the gate for a vehicle underneath it, and an operator with reversing sensitivity that backs off when it meets resistance. If an estimate leaves these out to hit a number, that is the estimate to walk away from.
Last, think about who needs through and how. A remote in each car is fine for a family. Once you add a housekeeper, a lawn crew, and deliveries, a keypad with individual codes you can issue and delete is worth far more than another handful of remotes, and phone-based control means you can let somebody in without being home.