Keylab 88 is basically The Analog Experience (25, 49, 61) rebranded with an updated controller, and some new-(er) software features.
The V Collection will work with your existing controller, even if it's a legacy product. Unless you currently do not have an 88 key controller, and you want one, especially one that integrates so easily with the V Collection, there's not much of a reason to invest in it.
I replaced a hardware synth of many years (Alesis QS7) to get the Analog Experience 49 partly to go completely soft synth while reducing the footprint on my desk, and it works flawlessly with all of my other soft synths.