Grigri on the wall because the leader can shortfix and start the next pitch on self-belay while the second cleans.
For longer multipitch I go back and forth between the Cinch and the ATC Guide for top belay. I tend to climb with a skinny tagline if it will require double ropes to rap and then I'll use the cinch to do the rap off the single line with a biner block at the chains/raplinks
For noobs, I put them on an autolock at first with constant surveillance to correct issues but convert them to atc's as soon as I'm comfortable with them. Especially if they're learning to lead belay since the shock of how much different the yank up is compared to the gym makes me think that they're more likely to freak out the first few times they experience rope through biners rather than the normal doublewrap around a fat drum belay system at most gyms.
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The safety issue is a strawman. The devices are not the danger, the way a climber perceives how to use the device and treat belaying that's a danger.
When people use the ATC va Grigri safty argument, what they're actually saying is "I'm afraid so I pay attention" vs "I'm not as afraid so I immediately stop paying attention"
explain the importance of belaying no matter the system used and you're fine. Or maybe if you need to put a grigri in someone's hands because you don't trust them to focus on keeping you alive, then just put the grigri on your own harness, build a bottom anchor, attach your dumbass simpleton belayer to the anchor (using his weight for a softer catch like a haulbag because that's all he sounds like he's worth), and then roped solo the route.