Type 74 (E) for example has undoubtedly better APFSDS shell, yet worse gun handling. I can be wrong but the Type 93 is the second best she’ll in this BR range behind the Taran’s 152 mm APFSDS.
XM803 has better protection overall, better mobility and gun handling, decent APFSDS shell despite the penetration values.
T-55AM/D-1 is a mid vehicle, 3BM25 isn’t the best shell but works, doesn’t have that much of mobility but works, gun handling is the Soviet pattern, terrible, the best you can find with T-55 in the designation sits at the Swedish Tech tree: T-55M, M1000A1 shell is better overall than the 3BM25.
the top round is better yes. and the type76 is a good plateform although pretty slow and poorly armored and requires a specific playstyle.
xm803 has worse armor frontally (no spaced armor and no composite in the turret). It’s has a worse gun (that can’t penetrate the t55am1 composite without the atgm), and is easier to kill.