FWIW these are my experiences. At various stages I have traded with 1)my own money 2) friends money and (currently) 3) other people's money (with a bit of friends money in the pot).
Psychologically I think they are all quite different, and purley from my own perspective one is not necessarily "easier" than the other. At the time when using my own money I had less experience and I was underfunded, which created pressure to put food on the table, regularly ! Result = overtrading & too much risk = blown account. ! I found the friends money stage to be tricky, because despite having rigid trading rules, other emotions started to creep in at times of drawdown, and there's always the feeling that there might be something more "at stake" ie friendships, if things don't work out. Result = undertrading (fear), +ve but mediocre returns. By comparison I have found it much easier to impose dispassionate discipline when trading OPM, as otherwise I'd have some explaining to do, and I'm paid to do what I do. The results are just the results, win or lose, although obviously I hope to continue to win if I'm going to continue to get paid. The main thing is that I "do my job" and stick to my methods as agreed with the investors. Also this account is far larger than previous accounts, and expectations (of a % return) are really quite modest.
For me the latter approach has produced the best % results too, even though I am trading far more conservatively, so therein lies a story, maybe. Of course we are all different psychologically, so other people's experiences may be quite different.
rog1111