Clipless pedals are a drastic improvement over clips and straps in both security and releasability.
I'm a fan of the original "Look" pedals due to security and, frankly, familiarity with 22 years of use. Snag toe edge, press down to lock, rotate heel out to release.
I would practice a while on grass or soft ground until you get comfortable with the motions needed. And yes, you will forget to clip out at least once and fall over at a stoplight or sign; it's a rite of passage.

I don't care much for SPDs but it's preference on my part. I think Crank Brothers is a better system for "walkable" cleats but since you already have SPDs, give them a whirl.

Many road shoes are dual drilled for LOOK and SPD patterns and this time of year, there are often good deals to be had on the extremes of sizing (munchkin and sasquatch sizes).

B