You can only compare Tiger to IS-2, since they cost same manpower/fuel/population and command points.
Based on in-game stats currently IS-2 has more armor and mobility
for the same cost.
'What if'-s are pointless.
But, but..
Tiger doesn't arrive at VET2 level so it's not unit but veterancy bonus related.
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10% more penetration ->(bulletin gives 5%) wow fuki'n nothi'n, also only affects vs vehicles
10% more range wow you need spotter anyways,
wow Tiger not good on open maps(flanking/easy AT target),
wow on urban maps range negated by buildings/etc anyways.
The meh buff for the same cost still not worth it, should be survivability.