Media players will play your videos fine. Regardless of OS, magkakatalo Lang yan sa codec
I have 8 year old media players sa apartments and all my renting families love them.
If you are divx media files yung USB ng tv ok na
If you want to maximize 4K grab the newer ones na android based if you fancy the interface
If you want android and the latest , hanap ka ng android based na firmware kit Kat lollipop at me mas bago pang releases ng os (himedia q5 and q10 android 7 out, himedia q3 is KitKat and is a workhorse sa playback 24:7 sa demo room of my archi friend. )
Specs are as good as the software that runs it. Find a vendor who can cover your minimum needs of colorful playback, beyond it it's all nice to have but a waste if its not important to your core purpose of buying
Ask for service units and repair policy, you might end up with a konk out player na di maparepair ng seller mo. That's where relationships to manufacturer matter.
Shop around, get a feel, make the deal.