DMF or solid flywheel?

I would stick to the DMF engines not designed for a solid flywheel

I concur. There are a few issues with a solid flywheel:

1) Gearboxes are built to cost, and suffer from the power drive impulses from an engine with solid flywheel. DMFs smooth out drive from your 4 or so cylinders. 2) The directly coupled flywheel in a DMF is lighter, and so crank vibration modes are higher in frequency. Using a solid flywheel, resonances will occur at lower engine revs and less likely to be absorbed, depending on the design of the DMF.

My conclusion some time ago was to replace like with like.

Was looking at solid but intending to go with DMF now. Thanks to you both.