Differences between 2 types of short shift kits

[smackboy1]

Thinking about getting an SSK and noticed there are 2 different ways to shorten the shift throw:

1) the replacement stick shifter type, which includes B&M, Schnell, EVO and the OEM SSK;

2) the transmission mounted plate type (% short throw can be adjusted by moving a screw), which includes TechArt, Ruf and 9ff (B&M used to make one too).

I've STFA and both seem to achieve the same result using different means at opposite ends of the shift cables. Can anyone who has used/installed both types tell me the pros and cons of either?

From what I can intuit the undercar tranny mounted plate offers adjustability (30%, 40% or 50% throw reduction) and it seems like the install would be simpler (once the car is up in the air) because you don't have to fiddle with disassembling the center console, disconnecting cables, alignment tools and other things that require fine motor skills (which I don't have). Seems it's just a matter of unscrewing some parts on the tranny and screwing in the new parts. Am I wrong? TIA.