Which is better for everyday wear?

The Quiet Lover. Its opaque microfiber is less revealing and comes in more sizes, so it works under more outfits.

The Sheer Lover's soft-fit tulle is described as soft and high stretch. Microfiber is smooth and sleek but can feel warmer. Both are built for comfort.

Does either come in larger sizes?

Only the Quiet Lover. It runs XS to XXL; the Sheer Lover stops at M.

Which holds its shape longer?

Both list high stretch and lasting shape retention, so they should hold up similarly. Wash both gently and air dry to keep the elastic and fabric intact.

Is the Sheer Lover worth stepping up to?

Only if you want the sheer look. If you want coverage and a wider size range, the Quiet Lover is the safer pick.

Sheer Lover G-String vs Quiet Lover G-String

Both are seamless-front, adjustable-waistband G-strings with the same 4.9 rating from 474 ratings, so the choice comes down to fabric and size range. The Sheer Lover uses sheer premium tulle for a see-through look; the Quiet Lover uses opaque Colombian microfiber and runs up to XXL. Buy the Sheer Lover for the sheer effect, the Quiet Lover for opacity, a wider size run and a sleeker side profile.

Choose the Sheer Lover if you want a see-through tulle G-string with an adjustable waistband and a soft, high-stretch feel.
Choose the Quiet Lover if you want an opaque microfiber G-string in a wider size range with a sleek side profile.

Prices

Sheer Lover G-String: $40.00 at SAMMY Menswear® (last seen Nov 10)
Quiet Lover G-String: $42.00 at SAMMY Menswear® (last seen Nov 10)
Difference: the Sheer Lover G-String is $2.00 cheaper than the Quiet Lover G-String at the latest prices (Nov 10)