Should I get an L visa or a Q2?

Hi, I am a US citizen and my wife is a Chinese citizen with a US green card. Currently we are both residing in the USA and plan to travel to China for a couple weeks to visit her family. My question is, should I apply for an L or a Q2? I plan to visit China at least once a year, and my duration of stay will only be for about 2-3 weeks at a time.

I want to get a Visa that will last for a while so that I do not have to re-apply for a visa each year. I read that I can obtain a 24 months L if I my spouse is a Chinese citizen. Is the L the best option for me or should I apply for a Q2? Can the Q2 be 24 months or longer?