Have not tried Marks; Next is our go-to as the Chinese brands our local (Israeli) stores carry have very unpredictable sizing. The biggest size I've bought thus far is for a preteen, but I've also been happy with their women's multipacks of all white or all black.
definitely not as good as once was. I stopped spending when mine were past 10 or so and just buy cheaper and replace every 8mths or so.
but if I were to choose, next.