I don't find the Ibex to be a straighter Buzzz at all. Its less likely to flip to flat and hold a straight line. The Ibex is better at shaping lines than the Buzzz. Ibex is far more versatile than the Buzzz, Id compare it more to a Millennium QMS with a bit more hss. Awesome disc, but the Buzzz excels at low line straight drives.
Tern - DD - Villain - XL - Buzzz - Warlock