There are many good layout point tools( such as Leditor, virtuoso, ICstation, laker, etc). But in the view of IC design flow (include physical verification and anaylsis), virutoso is the best one definitely.
I am using Virtuoso XL for few years and quite happy with it. The new version of cadence ic tools (5.1.4.1 I think) has some improvements for analog layout design, but I have'nt tried it yet. Can someone can share his/hers experience?
Tool is not the most importent thing, I think
I have uesd Virtouso and L_Edit, and Virtouso is better and more powerful.
And I have not uesd the laker, but my friend tell me it also be a very nice tool.
I have worked on Microwind, L-Edit for layout design. Currently, am using Cadence Virtuoso Layout Editor. Comparatively, Virtuoso is the best and user's friendly.