"Best" is highly subjective.
My first recommendation is to find an event near you that is doing FPV and try to get your face into as many FPV viewing systems as you can, and see what is best for you.
The three main ways to view FPV is by monitor essentially a TV screen you set up for viewing. Or goggles. Or a mix of the two, wearable screens such as the Quanums from HK or the Headplays.
Each one offers various pluses and minuses.
Goggles and wearable screens are just that, wearable. They offer the option of head tracking, which means you can turn your head and the camera on the aircraft will follow the motion. You're able to view the video feed wirelessly through a receiver mounted to the headgear, or for improved receiver quality, by connecting to an external receiver. There's a wide variety of goggles and a more limited number of the wearable screen types out there. HK/Quanum, Fat Shark, Skyzone, Cinimizer, Ezine, Zeiss, and others.
Screens can be tripod mounted or integrated into a ground station. You can more easily set up antenna tracking or improved antenna diversity. You are able to look from the screen, to directly (Line of sight) at the aircraft.
I'm a goggles AND screen guy myself, and love the Attitude V3's. I like that they are compact, lightweight and wearable. It has a modular system for frequency receiving, and most recently UBAD has come out with an aftermarket system that allows for frequency monitoring and selection as well as upgradable diversity. It doesn't have onboard DVR, which is one feature I'd have liked. You can get that with the next level up of the Dominators. I have a standalone screen which will provide me with the option of diversity and DVR recording. It also allows for spectators to see what I see, without giving up my goggles.
-Fred
