There is actually no difference when it comes to their wining rate or losing strike. Both casino games are build with higher wining difficulty so the casino would be on the wining side. There is no glitch in any casino games that let's you win always if there is the development team would work on it ASAP however all casino games is built on a random result generation so it's obvious you'll need luck to win from any casino game, be it slot or crash games all are dependent on luck and as experienced gamblers you have to stake only what you can afford to loss.
Luck indeed is one of the major factor that allow anyone to win in slot games since you can’t predict the result 100% no matter how good you are with numbers, even if the system is malfunctioning like you have noted it will be rectified and winnings which are still on winners account might be void, but on the other hand sometimes I do see crash to give little winning chance over slot games.