For editing voiceovers, do you find iZotope RX or WavePad more reliable?

WavePad feels a bit bare bones when compared against iZotope RX 11, but in my opinion, that is no discredit to WavePad. I say that more as testament to iZotope RX. WavePad is great and if you're starting out then you should start there. When you're ready for more advanced tools then you can look into getting iZotope. Some of the best advice I can offer is "only upgrade when you know why you're upgrading."

So many of us feel it necessary to get the best equipment and the best gear and the best this and the best that solely because it is "the best." When it really comes down to it, that is the equivalent of putting an F1 car in the hands of someone getting their drivers permit. Sure, they may now how to hit the gas and go fast, but the intricacies of the car are lost on them.

I tend to work with something until it presents a problem. When I have a problem I look for an answer or solution to it and if that answer or solution lies within an upgrade then at least I know exactly why I am upgrading and will make the most out of my upgrade.

Personally, I use iZotope over WavePad. Is it better or more "reliable"? Who's to say? It fits my more intensive and intricate editing, and I prefer the more in-depth features. You may not need all that yet and that's okay. WavePad has a free version. Play around there until you're ready to upgrade and continue that process forever. That's the true audio engineer's way.