Well, i've only bought Bowtechs over the last 4 years or so and their stock strings are top notch so there wasn't a need to swap them out intially.
If I bought a new bow by other manufacturers, I would buy a set of high end strings for it. Most bow company's strings are junk IMO and will creep and stretch through the life of the string. This will give you fits with peep alignment and overall keeping the bow in tune.