I have LOTR and GOTLE. LOTR has a little more depth, but GOT has more breadth with the multiple scoring multipliers, WIC hurry-ups, etc. I prefer the way modes are implemented on LOTR - they have a little more shot variety.
Art and audio quality are much better on Spike than Whitestar, but I think Whitestar is more robust and easier to repair yourself. I'm very concerned about how few fuses there are with Spike. My node 1 board failed and it's not even fused! Expensive little board too.
Finally, mods: LOTR supports ColorDMD now, and it looks fantastic. It's easier to mod the audio in Spike, using Pinball Browser. But I've never had the desire to change the LOTR callouts, because they're perfect.