It all depends on your need as each has their pro's and cons. There are some folks here that have "modular" automatic doors that you can buy in pieces depending on your set up. I'll let them respond to your call. I wanted something more all-in-one so it wasn't for me.
They are all relatively pricey at first look, but it's WELL WORTH the initial investment, trust me.
I went with a Pulletshut door. I just ordered my second one a year later for my new flock. Their home page is wonky, and their instructions aren't the best but at about 200 delivered, it's a very sturdy unit. Four screws/bolt holes are in the frame for easy installation.
The pulletshut door has a strong, THICK aluminum frame, with a fully enclosed motor/timer. A wire leads from the enclosure to be attached to a 12 volt battery. Once you connect it to a power source, you can now program the door. This is both a positive and negative feature in my opinion. Its positive because it's simple to operate (with a magnet) and can be opened or closed beyond programmed times the same way. The negative is that the time has to be programmed live. To explain, if you want it to open at 7am and close at 7pm, you have to be there twice to set those times at that time. It's not like a light timer where you can adjust it once and let it go. This really isn't a big deal except I usually don't have an opportunity to set it to the time I want until the weekend. Any time the power is cut (battery change), the timer loses the program. As the days get longer/shorter, I find myself changing the open/close times more frequently, but for the most part, it's set it and forget it.
I use Battery Tender Plus to charge a 12v battery. Now that I will have two in operation, I bought a couple more batteries, so that I have one at the ready when I need to swap. I haven't managed to jot down how long a charge lasts, but a tell tale sign is when the door doesn't open quite as far as it were programmed.
The door has a built in program to reopen once for a short period after the close time to allow chickens a second chance in case they get left out. I'm not sure if that really helps, but depending on the length of day, I can have a straggler left out sometimes. This is probably due to having the door close too early.
Hope this helps!