I believe the 200 is similar to the 150... in that the feed rollers are smaller than the 250 XP's, and thus have less crushing power, which I believe, also have a larger infeed opening and wider and larger feed wheels. Mine has an opening probably 18" wide, and the machine will chip 14" wide wood as long as the height of the material is under about 10".
I have had my 1997 250XP since 2000, and it remains a beast. The only problem is that the feed wheel grabbers (knives, teeth, whatever ya wanna call them) are so worn down that they don't hold back small material, hence twiggy things such as cedar or the worst, hazelnut, end up in long pieces, since they get pulled through way too fast. And that is with the new larger knife disc...which cost $7000, including labor, to replace a few years ago....
Just look up the specs for any machine that you find. I imagine that there are way more 250 XP's available, as it is probably the best selling self feeder of all time.... I dunno if the Vermeer 1000 has that kind of market penetration, but it can't hold a candle to the 250.....