For the Canon mirrorless m50 lens, should I choose the small spittoon or the Canon 22mm, biscuit head?

Wouldn’t it be better if you feel that the aperture is not sharp enough, and even if you change it, you should change it to a Sigma 50art or something like that. The small spittoon is 50mm, and the efm22 is 22mm. The focal lengths are too different, and they are not interchangeable at all. If you replace the biscuit head, you won’t be able to take close-ups of portraits, and the blur will not be as strong.