2 diffussor
Chromega II colorhead on my D3 for 6X9 (rarely) and 4X5" (hopefully a lot )
Durst Autocolor 707 for 6X6 and 6X7
1 condensor
Meopta Axomat 35mm only
One or two have to go though since my Darkroom has become a bit cramp already and I have to make room for a bigger work/wet table/bench and my CPE2+
Best regards
Diffuser on Durst M601/M670 for 120 and very occasional 35mm and De Vere 5108 for 6x17, 5x4 & 10x8.
Nicholas Lindan is right in saying that many condenser enlargers are semi-diffuser anyway, the Dusrt M601 with condensers gives similar results to the the same enlarger with it's colour head. There might be half a grade difference but the colour head is far less prone to dust or scratches showing on prints.
I am using a Beseler 45, Durst 5x7 Laborator and a small Durst F60.
All conensors. A home made light diffusingscreen is used inside the enlargers when I print portraits or something where the light should be a a touch gentler. It is a simple but effective solution for me.
I use both. I have two Durst Modular 70 enlargers. One B&W condenser, and one with the diffusion color head for 35mm-6x7. For larger work I have a Durst L-1200 with the 501 color head.
Although I have both a condensor (Focomat IC) and diffuser (Meopta Opemus6 with Meograde head), I prefer the latter...much less spotting and the highlights look better. I do use the condensor if I want to print on fixed grade paper and need the extra contrast.
I work on both. (ilford 500, and laborator 1200 condensor)
The condensor came in 4 months ago. At this time I only enlarge with the condensor. Much more crisp images.
I do not have problems with highlights getting to white.
If you properly clean your negs, dust is not a big problem. I work mainly on 6x6 and 4x5.
Diffuser - Meopta Opemus 7 with Meograde head. I went diffuser in 1979 with an Omega 6x6 enlarger with colour head, the chassis of which still serves as a mount for RH Designs nice little paper flasher.
Condenser - Philips PCS130/150 for both color and B&W. I also have a diffuser (Philips PCS2000) which I have not used since moving to the condenser (and don't plan to return).
Diffusion- Phillips PCS 130/150 - took out the condensers with the installation of the color head. Piece of diffusion film in the filter drawer. Prints beautifully, color and B&W, 35mm, 6x6.