Ansel Adams books recommend using a larger lens then is required. So for 4x5 that would be 150mm. Why compromise on the enlarging lens when we put so much emphasis and money in the quality of the taking lenses? An enlarging lens is just as important!

I personally use a 180 componon for my 4x5 negatives and can print up to 16x20 easily. Though I have to hoist my enlarger pretty high, which is wall mounted anyway, high enough to give me what I want.

There is no fall off what so ever and I get sharp prints edge to edge, corner to corner since I am projecting through the best part of the lens.