Which is better for standing all day?

The Linnie. It has a cushioned footbed, leather lining and a rubber sole. The Firewalk is unlined suede on a PU sole with no stated cushioning.

The Firewalk's full leather upper should hold up well, but its PU sole wears faster than rubber. The Linnie's rubber sole is the more durable base.

Is the Firewalk worth stepping up to?

If you want real Italian leather and a bolder look, yes. For comfort and everyday wear, the Linnie does more.

Do the Linnie mules run true to size?

Owners generally report true-to-size fit in medium width. The Firewalk's buckle strap lets you adjust the fit.

Which is better for work?

The Linnie's neutral almond toe and flat sole suit offices and long shifts. The Firewalk's graphics read casual.

Firewalk Black Suede Mule vs Sam Edelman Linnie Mule

The Sam Edelman Linnie is the safer everyday pick: a cushioned leather-lined footbed, a rubber sole and a 4.1 rating from 468 owners back up its comfort claims. The Firewalk is the statement shoe, with flame graphics, buckle hardware and full Italian cowhide suede construction. Buy the Linnie for all-day wear and the Firewalk for looks and a bit of edge.

Choose the Firewalk if you want a graphic suede mule with buckle hardware and Italian leather construction.
Choose the Linnie if you want a cushioned, leather-lined flat for long days on your feet.

Prices

Firewalk Black Suede Mule: $20.99 at Rockstar Original (checked today)
Sam Edelman Linnie Mule: $20.99 at AMOUR781 (last seen Nov 6)
Difference: both cost the same at the latest prices (Nov 6 and Nov 10)