The only, and the best.
The slings are by far the best on the market right now. The sewn in stitch gives them a smooth handling feel unmatched by competitors. Not to mention the exposed ends of competitors slings I've owned in the past have been subject to fraying whereas the sewn protected ends of the Mammut 8mm do not.
These slings are my standard trad sling whether it be over the shoulder or racked on my harness. The obvious downfall of using Dyneema is it's inability to hold a knot well, but there are easy fixes around there using other tools on your rack.
Overall I would recommed 10 60cm slings and 2 120cm slings for any climber looking to build their first trad rack.