Not a fan of watermelon red. Green pumpkin black flake or other variations of green pumpkin would be my preference.

Green pumpkin is my go to soft plastic color

Green pumpkin 90% of the time for me.

For me it is a matter of water clarity. The clearer the water the more translucent the skirt.

There is Watermelon Red Magic. It has black, red, gold, green, purple, and blue flakes that the fish can analyze and bite which color they like best.

 

 

LOL

I feel presenting the bait properly is way way way more important then color.

Very true , color of an unnatural baits is secondary to the action you are giving the bait ...

Watermelon colors-clear water/sunny conditions

Green pumpkin-clear to stained water/cloudy or low light conditions

 

and yes I've seen times where it made a HUGE difference which one I was using. 

I have some of both and have caught fish with both. The bait I catch the most fish with is a kvd magnum dreamshot in Brown purple. But I always have both green pumpkin and watermelon red I many different types of worms.

if I am imitating a crawfish I like the Watermelon/red more as often they have some red/orange color on them. If I am imitating a baitfish/bluegill I like the GP and a lot of times with a little bit of blue or purple mixed in... 

 

Mitch