They typically stay between 2-6 months here with their B1/B2. If I applied for a green card for them and assuming it were issued, they'll likely stay here for 6 months or more then spend the remainder of the year in our home country.
It's also not really about what's "faster" per se. The online system for visa renewal is just frustrating. We've submitted our renewal application, but the website user experience is just horrendous. There is no clear feedback as to what's going on.
The goal is to really just see them. They are senior citizens and TBH, couldn't care less what type of visa they have as long as they can see their grandchildren.
I am aware of this. I do not intend for them to come here and adjust status, they are happy with their B1/B2, but it is expiring soon. I submitted a renewal application, but it's taking too long and it is unclear what the status is online, so I was thinking of just applying for a green card for them if that's quicker.