I have six rifles but my favorite:
Steyr Challenge for FT Open
HW 97 V Glided and dressed in a custom made Gary Cane stock for recoiling FT
Air Arms Pro Target (unmolested) with a Bushnell Elite x32 AO for vintage FT
Anshutz 2002 SSP for 10m Air rifle
HW98 for HFT
BSA Mercury Challenger for vintage HFT

But if I could really only keep one and there wasn't an endless supply of compressed air I'd keep the 97. It's one of a kind and totally mine.