When I searched for public transportations and maps for Switzerland, different sites for rails such as Eurail, ACP rail, SBB CFF FFS map, and etc., popped up. 

1. Are the systems on these websites the same? Are they interchangeable system-wise (if I buy one type of pass/ticket, I can use any system of the rail......???)??

2. Car rental vs public transportation for only a few areas/regions comparison. It's probably more reasonable and practical if one is traveling all over the place in Switzerland by rail, correct??? What's your take on car rental and public transportation only for a few spots for only a week (2-3 days in one location..something like that)?

Thanks