Originally Posted by NomadVW
hill climb courses are easiest, imo, for outside. reduces a bit of the wind/aero component (though not all). If not there, maybe best on the trainer.
I agree that trainers are great for personal TTs. You don't get the thrill factor of riding with other riders in a public space but it certainly works. Trainers with power computers are relatively inexpensive too.
The only issue I have with hill climbs is that they measure something different than time trials on the flats.
Hill climbs measure your power output divided by the weight of you and your bike. Flat time trials better measure your pure power output regardless of your weight. Again, it's whatever you're into. If you love hill climbing then a time trial that gives you a good look at your performance changes on hills is probably a good thing.