I prefer JVS doors, and I've NEVER had them glitch out on me except when I exceded the limit of doors you can make, which was quickly remedied.
The JVS doors, albeit controversially considered "not fitting to the Blockland style," has become untrue over time. People have gotten used to, and have considered the JVS doors common. They move fluidly, something that this game's physics can boast a lot of the time, so JVS doors vastly improve the look of the game. I think that JVS doors have grown a part of Blockland over time, and can't entirely be removed, unless forcefully crap-on'd, which I think would be a shame to see, since it is a good innovation and a well-done system that provided some character to Blockland for a long time.