Sigma 18-50mmF2.8 vs XF16-50mmF2.8-4.8

Hello everybody,

I am trying to figure out which lens would be the better choice for my X-T50. I mainly shoot street photography or portraits of my newborn. I’m also taking a trip to Japan later this year and would like to take this lens with me. I prefer a cleaner image more than anything. Thanks for any advice.