u/Effective-Tea642

I am having trouble deciding which roku I should buy. I have a Samsung 65" smart tv 4k but my wifi card is going out so I want to get a roku to bypass having to deal with my connection constantly dropping whilst streaming movies. Which roku stick should I get? I do not want the ultra lol that is pricey so it's between the 4k stream stick or the 4k Dolby stream stick. I don't understand which would be better for my TV. Any help would appreciated!! Thank you!