From the modern point of view no, but back then it was true. There is nothing in the Jewish experience under Islam that is comparable to what went on in Europe during 1095-6, for instance.
Depends on the kingdom, I guess. Charlemagne was famously brutal in massacring non catholics in his realm and the early caliphates I think actually discouraged conversion because they had a muslim welfare state which was funded by taxing non muslims so it was in their interests to employ lots of christians and jews in order to fund their muslim subjects who weren't taxed and recieved benefits. At around 900 AD, there was no doubt the muslim empires were more tolerant.
But by the time of the crusades and the combination of the massacres of jews in granada and the outlawing of christian imagery and forced conversions in syria, there wasn't a huge amount to choose between being a non catholic in a catholic country or a non muslim in a muslim one. Neither were desirable.