There is a difference between 6m JT65 and 10m WSPR. On 10m WSPR I am often spotted by the same stations over and over again. On 6m JT65 there seems more activity and a greater variety of stations.
It is a pity there are not more users of WSPR on 10m. I guess people want it easy so go to lower bands when things get tougher? On 6m JT65, I expect activity will drop after the end of the Es season which is a pity.
WSPR and JT65 are good modes when conditions are marginal or variable as all stations are in a small part of the band and the station can run in the background. With JT65 you can have real 2-way QSOs too.