I enjoy the X0X sequencing style, so if this was my system I would hold on to the TR09 at least. I take a hybrid approach to drums with a combination of euro and an RD8. The monosynth sounds are easier to replace in the rack, but something about the ease of sequencing with a hardware drum machine works for me.
But, I am of the opinion that it’s best to part with any gear you aren’t using. I don’t get sentimental about gear anymore. I know others here take a different approach. I figure you can always replace it if you feel like you made a mistake by selling it.