Personally I tend to ignore the smart features. They are generally outdated before the rest of the TV is and the interface is a bit clunky. I'd favour a Chromecast or Fire TV for twenty quid and view any built in stuff as a bonus.
Never tried one of the JVC ones so I've no idea. Given that you can generally pick up a fire stick for twenty quid haven't it integrated wouldn't really sway my decision.
I haven't seen any in real life but I've read some poor reviews of HiSense TVs so I'd be wary of them.
In terms of the LGs they're normally decent. I'd also look at this Samsung
https://www.ebuyer.com/882385-samsung-ru7100-55-4k-smart-uhd-tv-ue55ru7100kxxu
Personally I tend to ignore the smart features. They are generally outdated before the rest of the TV is and the interface is a bit clunky. I'd favour a Chromecast or Fire TV for twenty quid and view any built in stuff as a bonus.