I think this might depend on how easy it is for you to adopt new layouts. You never mentioned if the 60% that you are on is an ortho or staggered or qmk compatible board. If it’s a qmk compatible board, you have probably experimented with layers in which case Corne would require more layer switching but wouldn’t be that foreign since you have already experimented with re-wiring your brain to realize new positions on keys.
The type of work that you do at the computer will also make a difference. Programmers constantly use special characters so the switch to either board would require higher than normal layer switching.
And lastly, not having a number row at the top (Corne) will probably be the least difficult adjustment compared to moving from staggered 60% to split, columnar staggered board. Like I mentioned before, you never mentioned anything about how easy those adjustments would be for you.
For me it’s simple, I’m typing on a lily58 with colemak layout and I have other boards with different layouts than this one and I have no problems switching between them, but I can’t make the same assumption about someone else in switching layouts, boards or layer configurations.