Really this should be
CT Basic
CT/MT Advanced
MT Basic
Twighlight 2000 1st
GDW House (T2K2.0, DC, C&D)
TNE (GDW house 2.2)
2300AD
Sp1889
TNE is career compatible, but not result compatible with the DC/T2K CG; the number of skills per term differed. (TNE was, IMO, an improvement...)
Me, best playing was T2K 2.0... as a GM.
But my players liked the CG of T2K and 2300 best, and in all cases, just above MT basic.
MT basic is slightly different (adds the Spl Duty roll, and Bonus skills on Comm, Promo, and SD, and uses more cascade skills) from CT basic. CT and MT advanced differ in about 3 entries....