If you are asking what is the difference gaming wise between a 22" 1920 x 1200 S-PVA screen versus a 24" 1920x 1200 TN screen, I'd say:
-The 22" will have a sharper image
-Your video cards will have equal loads* (see below)
-You may be able to see the individual pixels on the 24"
-The 24", despite what it says on the box or on the spec page, is not "true 24 bit color". It's 18 bit color "dithered" to try and look like 24 bit color.
-Screen fonts on the 22" will only be 7/8ths as big as on the 24. That is a size 12 font on a 24 will look like size 10.5 font on a 22....or a 1/4" high font (8/32") on the 24" will be only 7/32" high on the 22.
-Screen fonts on the 22" will have less "jaggies"
-Curved lines on the 22" will have less "jaggies"
-The 22" will have a much wider viewing angle, move around to the side of the screen and the bezel of the screen will block your view before the screen washes out.
-The 22" will have better color depth, contrast and color gamut
-The 22" will have a slightly slower response time.....typically 4-6 ms but a real 4-6 ms.**
* I don't know what picks up the processing load for dithering...in many LCD's for example it simulates a missing color by flashing an adjacent pixel on and off....now what "chip" is processing this action, I have no idea. If it's internal to the monitor, then I guess there's no impact. If not .... then something is going to have to shed load to handle this.
** The problem with advertised response times is leaves people with the same "what the ?" response that they get when they but a 500 GB hard drive and find they can only have 450 GB of space on it. That's because the marketing departments have decided that there's only 1,000 bytes in a MB instead of 1,024 and 1,000 MB in a GB instead of 1,024 .... same thing with advertised response times..... In all but the highest end monitors, the advertisers compete on the shelves by making their own standard for measuring this. About the only brand I have not seen play this game is Eizo, even Tomshardware tests have shown that Eizo monitors actually have better response times than they advertise. See:
http://www.lcdtvbuyingguide.com/lcdtv/lcdtv-responsetime.shtml
Resolution issues aside, I'd take a 6 ms S-PVA screen over a 2 ms TN screen in half a heartbeat.