I'm finding Ilfosol 3 to be very convenient developer. I've found it works well with FP4 , HP5 and Delta 100, all at box speed. Dilutions 1:9 or 1:14 seem equally good.
Ilford states that Ilfosol 3 is an equivalent to Xtol. My impression is that it has better accutance but that's an early impression. Few posters here mention Ilfosol 3 , so I guess mine is a minority view.