
First of all, both of these games are the property of Bethesda and the developers will not want to see these games in a direct “fight”. At the same time, each of these game series has its own loyal players, which will not ditch their favorite game for another one.

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Elder Scrolls 6
Normally I would say Elder Scrolls, but after ESO I think I'd rather see what they do next with Fallout now.
It's time for the next Fallout! By timeline it's already overdue.
Fallout 4 or GTFO.
Elder Scrolls for me. There's not enough fantasy titles.