I thinking it's between a Dreamcast and a PS2. The Sony has a bigger game library but im intrigued by the Sega console, the games seem more interesting and individual. I still have my XBONEX for current titles and previously had a PS4 Pro and a PS3. Im concerned that by choosing a PS2 the games will just look like poorer versions of what I had before.
My question then: are the Dreamcast games of high quality and are they involving enough, or should I just play safe with another Sony?
I am a dreamcast fan but honestly, I'd say get a PS2. They're much cheaper, the games are everywhere with a very wide variety available and are also much cheaper, the cables that fit the PS3 also fit the PS2. Having two analogue sticks makes life much, much easier (and the stick on the Dreamcast pad isn't great).
Yes the Dreamcast has lots of "individual" and interesting games (say about 50% of the games released on the system), but the PS2 library is so vast that the 10% of its games that are a bit unusual and interesting is still a far higher number of games than the 50% on the Dreamcast. Also, due to the controller design, DC games are less pick up and play and haven't aged as well.
If you want to play late 90s and early 2000s games, get a PS2. If you want to play Dreamcast games, get a Dreamcast. Which is definitely a valid thing to do, it is a very intersting little console especially when you take it online or get the mouse and keyboard and use it via VGA etc...