I picked the merchant/Partitio first, since I figured that having the merchant early would let me scale up money quickly throughout the game, and I recall the job being quite strong in the original.
I beat the game the other day, and I view Octopath 2 as simply a better version than 1 in most ways. It looks much better, stories are on average better, and there is a good bit of polishing and quality of life updates, such as being able to have multiple people use the same subjob, as well as the existence of ex skills.
I do have a few nitpicks, though - If you are sprinting (increases encounter rate) + fighting at night, the encounter rate is a bit high. Random encounters are also not very balanced - Eventually, you can beat all random encounters within the first turn, before any enemy can act. The gameplay ends up coming from story encounters and boss fights, which are paced pretty well if you do not explore overleveled areas.
Most of the jobs are pretty fun, though some are a bit niche now. Every character is strong, really only gated by how much babysitting/setup they require.
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