Which is better for standing all day?

The 990v3. Its thicker polyurethane and EVA midsole gives more support underfoot, and owners describe it holding up over long wear. The 574 is lighter but flatter, and some reviewers find its arch support uncomfortable.

The 990v3. It is built in the USA with a sturdier midsole and can be resoled. Some 574 owners report pairs falling apart within three months, and reviewers note inconsistent quality in recent pairs.

Is the 990v3 worth stepping up to over the 574?

If you want one pair to keep for years, yes. The 990v3 offers better materials, a firmer midsole and US construction. If you want a light everyday sneaker and replace shoes often, the 574 does the job.

Which fits wide feet better?

The 574 comes in normal, wide and extra wide, so it covers more foot shapes. The 990v3 is offered in wide width and runs true to size. Some 574 reviewers still find it tight, so try both if you can.

The 574, at 11.8 oz. The 990v3 is noticeably heavier and bulkier on foot, which some wearers prefer for support and others find slow.

Are both true to size?

The 574 is listed as true to size, though a few reviewers disagree. The 990v3 runs true to size in its wide width. Order your usual size in either.

New Balance 990v3 vs New Balance 574 Core

The 990v3 is the better shoe: made in the USA, a thicker polyurethane and EVA midsole, and a reputation for lasting years with resoling. The 574 is the better value and the easier everyday pick, with a huge size and width range and thousands of owner ratings. Reviewers of the 574 praise comfort and wide-fit options but report pairs falling apart within months and inconsistent quality. Buy the 990v3 if you want one pair to keep; buy the 574 if you want a light, simple daily sneaker.

Choose the 990v3 if you want a US-made, heavier-built sneaker you plan to wear for years and can resole.
Choose the 574 if you want a light, versatile everyday shoe in black and white with the widest fit options.

Prices

New Balance 990v3: $69.90 at Walmart (checked today)
New Balance 574 Core: $72.98 at Shop Simon (checked today)
Difference: the New Balance 990v3 is $3.08 cheaper than the New Balance 574 Core today