But these aren't even reasons that are most important they are secondary, Simply but The T34s 10 fuel cheaper price cannot possibly be justified when compared to the sherman who outperforms it in literally every statistical category without even using HE rounds, don't need to even toggle to beat a t34. Then has multiple abilities such as smoke, Pintle mgs and better vet abilities. Sherman wins and wins hard in every quanitifiable category for more than a poultry 10 fuel and 30 mp can justify. Except speed t34 is .1/6.5 speed faster than the sherman so to be fair that may make "feel better"
The T34's gun and the Sherman's gun armed with AP rounds have the same penetration at all ranges.
The T34 has an AOE radius of 2.5 and greater AOE at all ranges although to compensate for this, it has slightly worse accuracy in terms of scatter far and angle (Although this still amounts to the T34's gun being better in terms of Anti-infantry when considering overall statistical value of its AOE versus how often and close it will hit). The averaged out reload time of the T34 between far and near reload time is 6.4. The averaged out reload time of the Sherman is 5.8. They have essentially the same weapon except the T34 has slightly better anti-infantry.
Now, let's compare the Sherman's HE rounds vs the T34's main gun. The HE rounds have an AOE radius of 4 and greater AOE at all ranges and are slightly more accurate in terms of scatter angle/distance. However, this mode has virtually no penetration (25 to be exact) and switching out of HE to normal involves a 6 second delay which is very damaging if you've been ambushed by a/(multiple) tank(s).
Now, let's compare armour, HP and speed (the only other departments left).
The Sherman has the same HP pool as the T34 although it has 10 more frontal armour and 5 more back armour. The max speed of the Sherman is 6.4 whereas the maximum speed of the T34 is 6.5 (virtually the same). The Sherman costs 30 more manpower and 10 more fuel.
As you can see, they're very similar units. The Sherman is slightly better in most areas but at the expense of being more costly and not having as good units/ability complements overall (i.e Mark Target, Button, etc).