Hi, totally new player here. I pumpe dinto 4.0 LIVE and felt it was really laggy as well as buggy. Tested many different graphical options and saw an improvement but have heard the live experience may be laggy. Is it worth me starting out in the 3.24 version instead? Is that more stable? Kinda frustrating to be caught up in bugs like the train doors not opening at the spaceport 
I started recently as well; the rumor is the 4.0 Preview will retain progress into the next iteration, while live 3.24 will get wiped, so why start where you have less time to establish yourself. It is an alpha build regardless, and none of what we do it permanent until release.