DH2 probably makes more sense
HOI 1 could be fun for a few quick games, but you'd have to go through a steep learning curve. If you want to pick up an old HOI title, Darkhest Hour, for HOI 2, has some good mods; not sure about HOI 1. HOI 2 Kaisserreich isn't up to date with HOI4, but it's still a good earlier version of the nod.
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