All depends if you can turn your regulator up to charge at 9 volts. Some 6 volt setups can just barely do it, and some cannot. Depends on the model generator you have.
We used to install quite a few 8 volt batteries at our dealerhip - 30 years ago. But, now adays - at least where I live, I can't see where it's worth it. 8 volt batteries are a "specialty" and tend to be overpriced.
12 volt batteries much more common. If I were going to make a change for better cold starting, I'd stick a 12 volt battery in there and be done with it. A 12 volt battery, if sized correctly, will spin your "6 volt tractor" at zero degrees almost as fast as it turned at 70 degrees F with the original 6 volt . Any lead-acid battery loses 1/2 it's power at zero. So, if you have twice what you need when its warm out, you do pretty well when it gets real cold.
If you DO buy an 8 volt battery, make sure it's sized right. A small 8 volt battery that replaces a big 6 volt battery can wind up cranking worse in cold-temps instead of better. The nominal voltage means little. What counts is what your voltage drops to -when you start cranking. A big 6 volt battery might only drop to 5 volts when cranking, and a small (undersized) 8 volt battery can also drop to 5 volts when cranking.
Check your cranking voltage. If it's dropping to 4 volts, you can get a pretty good gain just by using a bigger 6 volt battery.
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