All right Curtis, I`ll bite. Both bikes were considered the better built at the time. You do not have a Montesa following, just a bunch of guys saying honda is better. Both bikes had flaws. The montesa had quite a following of after maket parts to `fix the weak points`. Honda riders hate to mention defects. (Most of the 315 trick parts are gone)
The Beta is what I prefered, but that was a personal choice. Like I said before years did matter! I`d ride them both. I always felt cramped on the 315. If I remember the 315 tank was small, suspension great, power on the soft side. If you could find a real clean `04 or `05 315 even this Beta guy would say buy it. If you are comparing a `99 315 to a 2004 beta, the beta hands down.
P.S. Curtis I was trying to be realistic!