I had a set of the weathertech in my 89 Range Rover ( Daily Driver ) and it is still going strong !. I also have a universal fir set from Sears whicch is holding up as well in my 98 Durango . Go figure. The most important thing in regards to your Benz would be proper fit. I feel the durability on these various brands will be about the same.
Alan

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )