I've owned both (have SW currently). Luci was a hard pin to let go of and if I had more space and cash, I'd still have it. However, I think (for me) SW premium/LE is a better game. SW has deeper rules that are more mode-based than score-based and I prefer the SW theme.
There were two reasons that I let go of Lucy. The lower playfield was a grind and I found myself trying to avoid the songs that used it and ultimately, I felt like the play came down to starting and stacking the three main multiballs. I loved them, but they became stale after several years. Sure, there is encore, but I was never going to see that lol. I did love having a huge jackpot loaded in the cannon. That was a rush.