Thought about it long and hard, but since I won't buy a second account because I'd miss a lot of paintjobs and ship kits, I had to carefully consider the implications.
The biggest factors are unlocking engineers, many of which require really tedious tasks to complete, specific guardian gear I find very useful, and military rep primarily for the Federation as I really like the Corvette. While the grind used to take a lot longer than it does now, I'd really not want to do all that again, even if I'd probably be much quicker achieving these now.
I'm still only single Elite, want to become Triple, and the fact I have access to Jameson Memorial and about 2bn worth of assets means if I want to quickly build any ship for whatever purpose, I can do so without grinding credits and/or mats.
Edit: Oh and I forgot to add, wiping my save means I'd also wipe the 'history' of my CMDR (stats etc. that will be visible in the Codex). Just feels wrong doing that as it's been a long road on my current and only save (playing since release on PC).