Since you are able to drive both, then you should see what you like. I have commented both ways in the past. The e-gear can be engaging and does require driving it like a manual. The roughness is on purpose to give you an eventful drive, although it can be easily driven smoothly by lifting for each shift. If you do like clutches and shifting, the gated manual in the Gallardo is great. The ease of drivability is not going to be like Porsche regardless of transmission, but it will also be more dramatic than Porsche.
You know what a manual is, and an e-gear is not an automatic nor a double clutch. It is a manual with an automated clutch that you shift with paddles. You will shift, and the computer will work the clutch for you. The e-gear was revised a few times, even during pre-LP iterations, so the stories of clutches wearing out fast are typically 2004 and maybe 2005 model years.
The gated manual is going to command a premium in purchase cost. However, the e-gear may need more maintenance, especially if it has not had any or been neglected, and that will also add to cost. It depends on the specific car as to whether the extra cost of a gated manual will be similar to the extra cost of maintaining an e-gear. For this reason, I would try to drive both and go with the one you want, which is always the best strategy anyway.
My current Porsche is PDK and my previous Porsches have all been manuals. I do like the e-gear but I might have searched for a gated manual to have an easier to maintain system if it had not taken so long to find and cost so much of a premium. I am not sure where future prices will go because while everyone is clamoring for the gated manual, the truth is that far more people can not drive them and would require the e-gear.