Harvey and Shane are the easiest to romance because gifts for them are so easily accessible. Harvey loves coffee, and Shane loves beer. If you're looking for who's quickest to romance between Harvey and Shane (assuming that it's your first day on a brand new farm) then it would be Shane, because he has a birthday in the first month, one of his loved items is beer which can be bought at the bar, and he frequently visits the bar in the evening which means, though it may be difficult, if you play your cards right you could have a dance partner at the flower festival on the first year.

i've never played stardew valley, but i did a little research on each character, and harvey seemed best to me

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Harvey forever. he is a sweetheart omg