I'm in the process of upgrading from the Eachine 007 and I'm struggling with the same question for a couple weeks.
Here's the pros and cons of each from my point of view:
Dominator SE
Pros
- Large FOV
- Price
Cons
- No HDMI means it's not future proof in case digital HD goes main stream
- Lower resolution (not a major con but still)
- Limited supply of LCDs means that they may be unrepairable once the stock is over
Dominator v3
Pros
- HDMI
- Price when compared to the HDv2
Cons
- Smaller FOV
- More expensive than the SE
- Over 1 year old model means the v4 could be around the corner?
I can't decide if 16:9 is a good or bad thing. Most people seem to prefer 4:3 but I believe that eventually, when digital HD goes main stream, everything will move towards 16:9 so why not get used to it already?
Dominator HDv2
Pros
- HDMI
- Resolution
- Large FOV
Cons
- Price
- HDv3 will be released soon according to some rumours
It's a tough choice since none check all the boxes, hope this helps you somehow and doesn't make it even harder to decide