50PUS8555 VS 50PUS9005/12

Looking for a 50" Ambilight TV max budget £500.

Looking at these two models, from comparing specification they both appear near identical.

Both are:

- 4K Ultra HD 3840 x 2160p
-2000 PPI
- P5 Engine
- Peak brightness: 400 nits
- Video CODEC: HEVC H.265 / VP9 with 4K upscaling
- Silver and Metal construction

Only differences I can see with the 9005/12 is

- Freesat HD
- Smart remote control
- Tabletop swivel stand design

Both priced at £499 with 2 year warranty.

Then I have this in the mix

50PUS7555

- 1500 PPI vs 2000 PPI - Will I notice this as someone who just watches SkyQ and Football matches?

- Peak: 350 nits down from 400 nits in the other two
- Made of plastic instead of Metal. uses loss power than the other two.

This is my first TV in 12 years so I'm a little confused about what the differences will be to look out for that I may have missed.

Can anyone assist?

Thanks in advance.