I prefer the island during the evening to the stalk market. It may be more time consuming, but I've noticed I can get a pretty good profit from there by fishing and bug collecting. If done for long enough, I can rack up a pretty good amount of bells in a few hours without the pressure.
I never really liked the stalk market to begin with since the GameCube days. The prices were always changing each week so you never knew what you'd be getting during the week they were purchased. Could be high or low. Then there's the price change per day after purchase. If not sold within that week they'd expire. It could get pretty stressful.
With island fishing and bug collecting it's much more relaxing to know that whatever you catch won't die or lose their value no matter how many days it's been since you caught them when it comes to finally selling them.
That's how it feels for me...