Choosing a niche for selling on Amazon

Trent recommends choosing a niche category for selling Wholesale on Amazon. How important is this.
Here’s the list of categories I have narrowed it down to:
Automotive & Powersports
Camera & Photo
Consumer Electronics
Grocery & Gourmet Foods
Health & Personal Care
Industrial & Scientific
Office Products
Personal Computers
Software
Sports
Tools & Home Improvement
I’m hung up here, any input appreciated.

@almoodie You may have trouble getting input on this as other sellers don’t want to point you toward the niche they have also chosen. Be sure you are considering object size, category revenue size, number of sellers in the category (tough info to find), and category growth.

Also look for any missing roles within the niche you may be able to fill. If you have prior experience in any of these niches it would be a good selling point when talking to brands.