Around here the price is close, I believe the Gold Dot or Deep Curl to be a much better bullet. Used the XTP for many years and quite often the bullet came apart and did not quite exit I believe the exit hole on the low side when hunting out of a tree stand to be important. When I switched to Gold Dots I found that I did get an exit hole but that a well placed bullet usually drop them on the spot .
On sabots; I try all the thickness that will work in both brands, for some reason [I believe the length may enter into it, also the compressibility] one will always group tighter and more dependable than all the others. I have found that with my lapped bores the Harvester shoots best about 60% of the time other than that it usually runs about 50/50. There for trying them all is a good policy. It may possibly have to do with barrel whip.