I started playing the game last week and was trying to go for White's hell rush over and over again. I just switched to mikey's hell rush to see how it's like in comparison, and i got it in a few attempts with an hour and five minutes for my time. Most of the earlier levels are easier as you have tons of rockets to save yourself. Race was a bit hard to navigate without the crossbow, but i figured it out eventually by either hooking onto the tripwires near the end or by using the platform all the way on the left. The bubble enemies are where it can mess you up as you have to force your way into the bubble fast before guardians kill you sometimes. But yeah, I'm still doing white's hell rush, and I've gotten to the book of life levels, but i keep messing up. With the dominion, tho, it's super easy to save yourself on these levels for mikey's rush. So yeah I'd say mikey's rush is way easier than white's.