I am gearing up to take the September LSAT as my third attempt. I took the first two attempts from by desk at home, and fortunately did not have any issues other than my lack of preparation lol. I plan on taking my third attempt online. If you take your PTs from home, then I would suggest taking the online proctored option. Make sure your PTs are taken at roughly the same time of day, to ensure that your routine is consistent to your test day. I don't have any insight regarding the testing facility option, however if you are concerned about technical, WIFI, or atmospheric difficulties of online testing, I would suggest playing it safe at a testing site. Hope this helps.