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0 ping generally speaking is much easier to jump on, you don't have to take into account the amount of time that lag will equate for. You can do everything in "real time". I find it much easier for demo than soldier.

I like to play on the tempus servers, similar ping to what would be on actual servers and nice variety and tools

for demo jumping you should do it on low ping. zero is best but up to like 35 is fine. it will be a lot easier to learn air pogo because you can see the stickies. being a good demo jumper on high ping is extremely difficult, you have to know all the timings relative to your velocity etc cause you cant see shit.

for soldier the timing is pretty much the same online and off, I would play online. the timing of syncs is the main thing that you have to be consciously aware of (higher ping = synced rocket is going to hit sooner than it looks, so jump earlier. if falling you have to fall further past the rocket before shooting, this is because of lag compensated movement putting your viewpoint ahead of where you actually are on the server). the other thing is on 0 ping you see every rocket explosion, its not good for your eyes, so on lan I would disable explosions or use like 20ms of fakelag.