It will take several hours to be truly comfortable with a new digital display. At that point you'll wonder why you even thought about keeping the old stuff. You WILL adapt to it though, no doubt about it.
Can't help you with the second part, ;-) If you truly like the aesthetic of the old style gauges then that is probably what you should get. We each build our planes to suit ourselves with our own inividual set of likes/dislikes. Don't ya love experimental aviation?