I have both combined with Dynaudio 1.3SE
For me the sound is great but I must admit that over the years I did not compare very much.
From 1972 untill now I had the 44/405, 44/606 and 99/909 combinations.
Reliability is top and the tone control (hated bij most purists) works great.
Some time ago I switched from the 44/606 to a Lyngdorf TDAI2200 but after one month I made a deal with the seller and traded the Lyngdorf in for the 99/909.
The sound of the Lyngdorf was too cold/analytical and missed the soul I find in Quad gear.
For me the sound is great but I must admit that over the years I did not compare very much.
From 1972 untill now I had the 44/405, 44/606 and 99/909 combinations.
Reliability is top and the tone control (hated bij most purists) works great.
Some time ago I switched from the 44/606 to a Lyngdorf TDAI2200 but after one month I made a deal with the seller and traded the Lyngdorf in for the 99/909.
The sound of the Lyngdorf was too cold/analytical and missed the soul I find in Quad gear.