Different levels of risk are acceptable to different manufacturers. Certain makers also are trying to prove something, or are trying to attract buyers purely with their warranty.
Its like going to a car dealer, and seeing a Kia with a 10yr/100K mile powertrain, 5yr/60K bumper to bumper versus a Honda with a 5yr/60K powertrain and 3yr/36K bumper to bumper.
The warranty doesn't determine the better vehicle/vessel.
I'd certainly take a Honda over a Kia.
I'd take a Parker over most other boats out there, no matter the warranty. You also need to read the fine print, most warranties aren't transferrable, and some require you to have the boat winterized at the dealer. Heck, some are even invalidated by any gelcoat damage. Who doesn't occasionally bump something and crack the gelcoat.
The thing to consider, especially in economic times such as this, is:
Is this MFR even going to be around in X years, when the warranty is up?
I'll bet that Parker will be around for a good long time, but we may see the demise of several major boat builders in the next few years... There's already been rumors of one going under.