Hey Maverick, welcome to the forum! Yes, you're in the right place.
Indeed, Range Rovers are more problematic than their German competitors. But, not to the point where you should stay clear. The key about peace of mind is to have an extended warranty if you're buying pre-owned; and the best way to go about that is to buy a CPO car. There are lots of posts on this forum talking about extended warranties. Do a search and take the time to read them.
The new vehicle RR warranty is four years. So your sweet spot right now is to buy a 2017 or 2018 CPO. You're getting a large discount from new, two to three years left in the original warranty, plus two years of the CPO warranty. So you could end up with essentially a four or five year warranty on the car, which is a win-win!
There is a big difference between the V6 and V8. The V6 has adequate power. The HSE Dynamic bumps that power to about 380HP and you can feel the difference for sure. The V8 is a monster. If you want to drive an SUV that feels, drives and sounds like a sports car, the V8 is the way to go. If you're looking for a more subdued, refined and luxurious drive, the V6 will do well. I have owned both. I started with a 2014 V8 and now I'm on a 2017 V6 Dynamic. For my style of driving, the V6 is a much better fit. With that said, engine is a very personal choice and only you can answer what is better for you.
There are no good or bad years, but there are significant milestones that you might want to consider:
2014 First model year.
2015 Introduced in-control apps. They're a joke. Ignore that!
2016 Introduced auto access mode (where the car lowers itself when you turn off the engine) and kick-to-open tailgate (where you kick the bumper with your foot and the tailgate opens).
2017 Introduced the new InControl Touch Pro infotainment system. This is a HUGE leap forward from the old system.
2018 Introduced the refreshed body style and new double InControl Touch Pro Duo double screens.
There is no wrong or right way to go. Some people put more effort on engine power some others put it on creature comforts. The one key component that you should really consider regardless of everything else is the extended warranty. You're gonna pay a premium up front (meaning it's going to cost more to buy a CPO car at a LR dealer than one at another automaker's used car lot), but in the long run you'll save yourself a huge headache with service once the extended warranty kicks in.
Hope this helps. Keep us posted!
Jose