Both categories have their ups and downs. Those G-forces in Formula probably are hard to take. Also they whine how hard is for them, while rallying take on icy, winter roads, hot as hell too and with events whch transforms from one extreme to completely different one. In rallying drivers and co-drivers are the ones who often fix their cars to be able to race, changing the tyres while formula drivers doesn't need to do nothing and wait (and still whine). Formula drivers gets payed in multimillions just to be there, while rally drivers need to work very hard, achieve absolutely maximum to start making money out of this sport. Of course formula drivers also have field full of other drivers while rallying is focused more on being attentive to roads ahead and time.

But one fact is quite funny. Formula drivers are often afraid being in rally car while they racing with 300kph on perfect paved circuits.

So both sport have their own challenges, shame just that WRC isn't worth more.