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I have fairly strong fingers, and have not experienced any fatigue with either greens or blacks (or BS, for that matter).
Many people do, however, report aching wrists and fingers when using blacks or greens, and although some of these could be due to posture, there are probably a few that are the result of the stiffer springs in these switches.
Personally my first modern PC-compatible mechanical keyboard was a Ducky Shine with MX blues and red LEDs. My second was a Ducky Shine with MX blues and green LEDs. My third Ducky Shine (on order atm) has yellow LEDs and MX black switches.
So I would probably go for the same switch that you already like, and different LED colour. With the disclaimer that your curiosity about different switches will grow until you are compelled to purchase another keyboard anyway.
As a thought: presumably you are purchasing these new. You could get a new Shine with different LEDs, and then bide your time and pickup a relatively inexpensive used keyboard with greens. If you don't like the greens, you won't have lost much.