TLDR: How reliable is the Sling stream on wired (ex nVidia Shield) vs wireless (ex Tivo 4k) at 720 to 1080p?

So I've been crunching some numbers, reading some articles, and I've found that I can save probably $400 - $500 a year if I ditch my cable and use Sling Blue. In some of these articles, they say that the Sling wireless performance is unreliable as far as picture resolution. I'm wondering what everyone's experience is with that?

My current set up is a Tivo for cable TV and either an Amazon Fire TV 2nd Gen or a Tivo Stream 4k. I love my Tivo, but it's about 10 years old at this point and when it dies it dies. I won't replace it because the FCC said they're no longer requiring CTV providers a tuner card. I love my Fire TV, but it's 5 years old and bit long in the tooth. I'd rather not get a stick or a cube. I bought the Tivo 4k because it was on sale and I wanted something closer to the Android ecosystem. I'm also not against ditching it for nVidia shield with the ethernet port.

My FireTV is hard wired and my Tivo 4k is wifi. Before the pandemic, I never had a problem with the FireTV streaming Netflix, Amazon, Youtube, or Plex. I've had the Tivo 4k for about a month and have seen no decrease in quality except on some streaming channels on youtube (which I think is ok with everyone being home more these days) .

Specifically for those of you who have a wireless Chromecast with Google TV, Tivo 4k, or other wireless-based AndroidTV stick, how has your Sling performance been? I'm perfectly fine with 720 to 1080p, but anything lower than 720 I would not be happy with.