u/Ok_Increase_1270

My goal race for spring 27 is a 100 miler with 18k ft vert. Should I do a 100k with 10k ft vert or 100 miler with 10k fr vert (looped course) for my fall race in preparation for my spring race?
For context, I’ve done a couple 50ks and a 50 miler. Currently rebuilding my base and will be back at 60mpw by September