I use the Durst 138 for a good deal of 35mm and 120. For those film sizes, I use Carlwen negative carriers, which to me take as much effort as medium format enlargers I've used (LPL, Omega, Beseler). With the Durst carriers, I found 35mm and 120 quite cumbersome to enlarge.
I use an 80mm lens for the 35mm negatives which keeps me away from the Latub lens board that the 138 requires for a 50mm lens. I tend not to enlarge 35mm negatives as much as 120 or larger negatives, so using the 80mm lens isn't an issue. I found the Carlwen carriers on ebay a few years ago.
I love my Durst 138 (cold light head) ... the head cannot quite make it to the top due to the lower ceiling in my current darkroom ... but I swear, I'd rather cut a hole in the roof before I ever discard the 138!! I had a 'short' in the circuit recently and my friends father (who was once a specialist electrician in the Antarctic) fixed it for a 'slab' (24 cans of beer in Australia) ..... he did it in an afternoon and as it was a Saturday he couldn't source high voltage cord until he realised the local motor-mower shop stocked miles of it. This story is probably not so related to the thread but nevertheless part of the 138 story! I also replaced the old tram wheels it originally had and replaced them with some good quality castors which did compromise the total height of the enlarger, hence now I can't jack it up to it's maximum.
Don't get rid of the 138S. Get a larger camera.
I use a Saunders 4550XLG/VCCE enlarger for 4x5", 6x7cm and 35mm.
I use the 138S for 8x10" enlarging and 7x17" contact printing. See my gallery for two shots of the 138S with an Aristo 12x12 cold light head and 8x10 negative holder.