I own a CT2025H delivered in Dec 2020.
I miss understood the three options and the dealer was ignorant too.
I chose the Spring Return + Detent option. Which results in one lever having no detent. The second lever has a detent with spring return. If I had to do over, I would have select both detent. I use this with a flail ditch mower. neither type "float" like the FEL bucket.
One downside to the detent is that during operation in brush or low limbs, the levers can be hit by the brush and unintentionally locked in detent (full flow).
This is an obvious noise difference and robs of HST flow - drive power/speed. Its a nusiance, nothing major.