That pendulum swings both ways...can be countered with stories of cops or CCW holders getting killed when they forgot to flick their gun's safety off. There's plenty of anecdotal material either way.
Advantages and drawbacks are unique to each system.
Semi-auto has generally higher capacity, is usually flatter and easier to carry IWB, is faster to reload, and has more portable reloads.
On the flip side, semis are more prone to malfunction, can lose or break their magazines (detachable part of the weapon which is an integral part of the feeding mechanism), and are often ammo-sensitive in regards to bullet shapes or charge loads.
Revolvers have a higher power-to-weight ratio, are less prone to malfunction, comprise a closed weapons system with no parts to break or lose, and have no safeties to accidentally engage or disengage. They're also completely ammunition-independent as far as bullet shape or charge levels go.
On the flip side, they generally hold less rounds than an auto, don't carry as well inside the waistband, are slower to reload, and have bulky reloads. (Speed strips are flat, but not very fast...speed loaders are quick, but more difficult to lug around.)
I carry and appreciate both, but I'd prefer the revolver if I had to choose a platform. Less rounds, but more steam, and five or six for sure. My reload is a second gun anyway, and with a little practice you can reload a wheelgun mighty fast.