Go on - your top 3? I like waterfalls as well as summits. Not keen on routes through farm yards or enclosed fields, I like being in woods or on open hillside
The Hobby Drive from Hunters Inn to Woody Bay and back on the SWCP via Heddons Mouth - coast views and a Waterfall. Brendon to Lynmouth and back, going down one side of the river and back up the other via Watersmeet. Dry Bridge, over Shilstone Hill, down to Malmsmead, up the Badgeworthy through Doone Country to the medieval village and back to Dry Bridge across the moor. Simonsbath, along the Barle on the Two Moors Way then back along the ridge via Pickedstones. Withypool, over Withypool Hill then Exe Valley Way to Tarr Steps and back by the river on the Two Moors Way. Various routes on Dunkery Beacon. I have the traces for these on the OS site and ViewRanger.
I will leave BuzyG et al to do Dartmoor.