As a landscaper and maintenance gardener, I spend a ton of time resolving issues caused by poorly planted and deficient ground covers. I have several clients that wish they had just paid for the mulch and skipped the vinca and creeping jenny. Especially after it escapes into their lawns. All these plants have their place, but properly applied mulch is the best solution in the long run.
Good point. I favor shredded hardwood bark mulch, which is plentiful and cheap in this area... a by-product of the local lumber industry. I do love cedar mulch, but here it's much more expensive. Some favor it because of its insect-repellent properties.