You said you don't want to deal with computers and you're not even sure about tablets, so I assume you have no stored music library or interest in one and that takes away some of the value of Roon and a Roon Core. While a lot of the responses have been on sound quality, those are based on opinions, all of us have different ears and tastes, none of us have heard everything, so you're going to get some good advice but no consensus. Two considerations I haven't seen mentioned are ease of use of the associated applications and the streaming services you plan to use or try. I tested an Innuous and while the support in England was very good, they had no plans to add Amazon Music or (Tidal) MQA so that limited two services I was interested in. If you go Innuos, you'll probably be limited mostly to Qobuz, which has good sound quality but for my tastes isn't as easy to use or have quite as much of the music I like. Most streamers' apps work with Apple products but some struggle with Android. Some are easier to use than others so make sure you factor that into your equation. Innuos works better with Apple, I believe, and I tried another that froze so often with my Android tablets I gave up and returned it. I didn't want to keep an iPad around and charged simply for music but you may decide otherwise. The extra screen size of a tablet over a phone is pretty handy for selecting your music and viewing details on the band and song.
For what it's worth, I bought a Bluesound Vault 2i. Yes, it may not be an endgame unit for a high-quality system, but it's a good all-in-one introduction to streaming and it couldn't be simpler. The Vault lets you burn all your CDs in the unit and since my CD player was old, I did that and once complete, I haven't touched my CD unit since. It's so simple to pick and choose among my library and all the music services. The interface is simple, not as good as Roon but it doesn't cost me an extra $120 a year. I figure I can always add a better DAC or combination and move this into my second system.
For what it's worth, I bought a Bluesound Vault 2i. Yes, it may not be an endgame unit for a high-quality system, but it's a good all-in-one introduction to streaming and it couldn't be simpler. The Vault lets you burn all your CDs in the unit and since my CD player was old, I did that and once complete, I haven't touched my CD unit since. It's so simple to pick and choose among my library and all the music services. The interface is simple, not as good as Roon but it doesn't cost me an extra $120 a year. I figure I can always add a better DAC or combination and move this into my second system.