well if your planning on making a commercial game there are some ups and downs for each program
1. FPSCX10 has better graphics and has lots of cool features
2. A lot of computers are not good enough to run games made with FPSCX10
3. FPSCX10 does not have the same license as FPSC V1 in X10 you have to buy a $1000 dollar license if you make more then $5000 dollars
4. FPSC V1 does not have the best graphics BUT most computers can run it.
5.The license is completely free.
6. The FPSC V1 migration is hopefully going to be this year and that will make it better.
7. There is more free media for V1 then there is for X10
Hope that helped some
"The Beginning is the end."