Too much tanks and too much modifications for each to compare.
Here tank generations:
1 gen: 88-100 mm gun, 150-200 mm steel armor. (T-54/55, Centurion, M47/48).
2 gen: 105-115 mm gun, more thick steel armor. Active night vision, automatic fire supression systems, stereoscopic range finders, gun stabilization, mechanical ballistic computer.... (T-62, M60, Leopard 1, AMX-30)
3 gen: composite armor, 120-125 mm gun with APFSDS rounds, automatic FCS, laser range finders, thermal sight, protected ammo, high power to weight ratio (M1A1, Leopard 2, T-80, T-90, Challenger, Merkava 3, Type 99, Al Khalid, Arjun...)
3+ gen: independent thermal sight for TC (hunter kill option), battle management system, improved armor, fully electrical turret drive (M1A2, Leopard 2A5, Challenger 2, Merkava 4, Leclerc)
------------------
There are also tanks that fall in the middle. For example T-72 and Chieftain had powerful guns and armor, but had weak FCS and underpowered.