Narrow wides do have their place, they do hold on to the chain quite well. They're quite cheap now as well. I've run various 1x setups and never dropped a chain with a narrow wide. But with a decent chainline you can use a ramped ring and the chain should stay put.
In regards to mechs, I prefer non clutch mechs but as mentioned it depends on the riding you do. For milder off road, fire roads and the occasional bit of singletrack, it's necessary. For proper offroad with rock gardens, rooty and bumpy singletrack and what not, it is probably worth it to have a clutch mech, just to keep things tighter.