Some people believe that it is bad grammar to "split" an infinitive i.e. place another word, usually an adverb, between "to" and the main verb. It is a debatable area of grammar, but for me, it would make much more sense to say "to invidiously compare" here.

The split infinitive is a feature we got from the Vikings, alongside SVO word order (compared to the previous SOV word order) and simplified declensions and conjugations. A few hundred years ago it was 'decided' that the split infinitive was wrong because it wasn't allowed in the much more pure (in their eyes) Latin. When it comes to arguing whether something is correct j English, the argument is usually about whether it was historically correct vs. whether it is commonly used now. The split infinitive fits both of these criteria, so in my eyes the argument that it's wrong is very weak. Nowadays very few teachers say it's wrong as well. I also just checked the Oxford Dictionary, which agrees that the argument that split infinitives are wrong is weak, but suggests avoiding them in formal writing if you can still make it sound natural for the few who still object to it. If you're doing English in a class, I suggest you check with your teacher. If they say split infinitives are correct, feel free to use them. If they say they're not, avoid them *only* in assessed work.