You don't get much from either one. If a certain amount of Dx9 code is anticipated, for which bog-slow speed is acceptable, an FX 5200 can simulate the SM 2 functions using its 32-Bit precision nVidia hardware (actual Direct3D functions in SM 2 are 24-Bit precision). The Radeon 9250 is a down-graded 9200, on a new die, while a 9200 was originally a slightly modified Radeon 7000. Neither of the cards named are really worth $50. A dealer can buy lots of a dozen each (of the AGP versions, admittedly) on eBay for $200; that's $16 each.
Modern onboard chips from ATI and nVidia are better than these tinker toys (Xpress200, Nforce6100).