I guess some may get dazzled by the various names it's been called but to me it's all the same (UHD 4K).
As to better, there's always better but what price? For example the current high end might be the new 8K TVs. CNET covers some of that at https://www.cnet.com/how-to/should-you-be-worried-about-8k-tv/ but I suggest you plow through the CNET article since it gives you a heads up on HD, UHD and maybe beyond.
So what to buy? I can't answer. But I can write that to get 4K content you might have to change your service. You don't have to as all models I've seen accept the 1080p input and upscales it to fill in all the pixels.
That said I need to update my living room TV last year and bought a plain 1080p TV for cheap. I don't watch enough TV and for me, 1080p looks great.
Also check out https://carltonbale.com/does-4k-resolution-matter/
the last time i purchased a TV was like 10 years ago , i think i have an old plasma still.
im after some advice , i have seen this tv on amazon http://amzn.to/2z3PqPG
i am wondering if this is the latest technology to buy as i have heard of something called ultra HD but never really known anything about it . is there anything better out there and if so what ? and also do i need any special leads or subscriptions to watch it in Ultra HD sorry for the noob question but its been a while since i last purchased tech