Test rode both prior to purchase, the GT ticked most of the boxes for me and had all that I wanted with the exception of Mid pegs and colour. I was told that the mid controls kit had a long lead time so went with the R... still need to get the GT bars, but Triumph are not shipping accessories to the dealers in the UK currently as most are closed and even those who are manned with skeleton staff are not getting deliveries from HQ so I have to wait for the bars and the other bits I want to add.
These times are trying and testing for all of us... we just have to be patient.