You are most likely aware of the Casio, Yamaha line.
I like recording on minimal means with sparse overdubs.

But I like Casio CTK-411, the more recent CTK-720, and Yamaha Portasound PSS-470 for some quirky eighties type sounds.

I have more synths, but having a bunch of synths can not camoflouge whatever poor songwriting I have though. Or what I am out to do with my artistic goals

But the 411 and Portasound are the synths that I have used online.

The Casio CTK-720 comes with software.
Although all synths most likely do now.

That is how old most of mine are.