To my eye, the GTS has a chance of being faster - I think it weighs less and has a bigger engine. The GT4's engine is basically stock, I think a requirement for the classes where it competes.
If the price ends up being fairly similar, I'd give the GTS a try - if nothing else it will be so rare/special, you will aways be able to swap it out for a GT4.
But I'd really like to see some instrumented tests. (Fat chance though, with the cars being so rare/expensive).
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2018 F80 Santorini
2019 Z4 3.0i
2022 X2 M35i
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