I agree with HarleyRyder, I been to Havasu many dozens of times over the years. All but maybe 5 times, I have gone I-10 to Desert Center, then 177 through Vidal Junction to Parker. (Except, I don't understand the tire issue, the road isn't that bad).
There really isn't much difference between 95 on the California side and 95 on the Arizona side. (Yes curiously, there are 2 different Hwy 95's a few miles apart.)
The California side seems a little more senic and shorter, while the Arizona side is probably a better road. Trace