My sense is - and feel free to correct me, anyone - that most of the "with strings" jazz albums were created with the goal of trying to quickly broaden the audience for jazz artists. Maybe that is why more thought didn't go into choosing the arrangers or aiming for more adventurous approaches.
Still, some of these albums are better than others. I like Ralph Burns's arrangements for Lester Young. Also like the arrangements on the Sonny Still album (can't remember who did them).
If you mean the Stitt album with strings of Ellington-associated material on Catalyst, the arranger was Bill Finegan (of Sauter-Finegan Orchestra fame). There were, I believe, at least two other dates with Stitt and strings, one for Granz with Ralph Burns charts, another for Prestige with charts by Billy Ver Planck.
It's the Stitt-Burns album, Sensuous Sounds, on Verve.