It depends on your local terrain and physical condition.

We have four cruisers; two single speed, a 7 speed with Nexus hub and a 5 (?) speed with electric motor. I prefer the single speeds because they're simpler and I have other bikes for longer/hillier rides. My wife prefers the geared ones because they're easier to pedal.

The 7-speed is an Electra. It's been sitting outside a few blocks from the beach for almost 15 years. I shoot WD40 on the chain every couple of months and it runs fine. I ride it when I go to the store and need a basket.