Light tanks late game?

So, i'm at 1947, Took over Europe (except England and Span (I used Spain to decimate their aircraft but I can't break through.

Invaded Turkey to Saudi Arabia and Iran (now stuck at India due to supply chain)

I'm importing allot of Chromium from Russia, but I'm thinking of improving the yield of Chromium from conquered Turkey (also improving oil yield)

To do this, I'm thinning of stop importing Chromium to use the civ factories to improve the tiles.

I will have a lot of unused military factories after I use them to create Modern Tanks, and Medium III Tanks.

I already have tons of planes, infantry weapons, artys, and anti-air.

So, should I build basic infantry or light tanks?