I do not agree with the "first Buffy" notion. I've always found Kristy Swanson a very poor actress, seeming to be getting by on looks, particularly her appeal to men, though she surprised me in "Bad to the Bone". Kristy as Buffy is quite awkward at times; she simply doesn't move that well, at least in this film. My response to the movie was definitely lukewarm. Even Rutger Hauer disappointed me, which was a shock, as I usually enjoy his performances. It was an OK film that I watched again if there was nothing else available.
I was intrigued when I heard about the series. I had never seen Sarah Michelle Gellar in anything, so I had no expectations of good or bad. My family watched the first episode and found it completely entertaining but supposed it would fall into the monster-of-the-week rut that haunts many supernatural series. However, "BTVS" became a must-see on our viewing schedule, and we stayed with it to the very end. (My mother~now in her early 80s~is particularly taken with Spike.)(I, at nearing 60, agree!)
I always have done a lot of penpalling, and I know for a fact that my fellow Baby Boomers and those of other ages (younger and even older) throughout the States are loyal fans of the series. It also proved popular in other countries where I had penfriends. All of us watch reruns, too. In fact, I generally tune in at 3 a.m. to watch the nightly episode on Chiller Channel. I have the series on videotape and often treat myself to a marathon. At this point, I have no idea how many times~perhaps several dozen~I've watched the series. There are moments that still make me cry, and I don't cry at series/movies very often; and, the humor never grows stale. It's also one of the most quotable series I've ever watched.
I vote for Buffy No. 2 though I started with Buffy No. 1.
EDIT: I had to come back to say I've never been a Luke Perry fan and still am not. I don't mind him as Pike, but I had heard about him being such a sex symbol from that series, which I've never seen. I kept thinking, "THIS is who they're making a fuss about?" I simply couldn't see it. His "draggy" voice is irritating, too. So, don't think for a moment I watched the movie for him. First, I love horror~comedy and drama; and I especially like the vampire genre. The movie was and still is (I watched it tonight as a "filler") on the "blah" side. There are a few quotable lines, but it's just off for a number of reasons, most of them pointed out by others. I must say that I still do not get the attraction to/fuss about Perry.