No. They'd be 10x hotter. Femdom with someone you have a deep relationship with is a completely different thing than with someone you have what is ultimately a business relationship with (although relationships with prodommes can take a distinctly personal turn also, given how personal and intimate the activities are).

The point with a pro domme is: it's unlikely you'll be doing the things with your wife that you do with a pro domme. A pro domme may have devoted years to doing this. She will have all kinds of skills in that time, that can take a lot of time and training. These can be hard skills, like techniques with particular toys. But a lot are even harder-to-develop soft skills -- how to roll one activity into another so they build on each other, how to read your reactions so she knows just which direction to take things, etc. So this question is a bit like saying, "would my wife take better care of my car, than my mechanic does?" Well yes, sure, if your wife were a mechanic herself; if she's not, then the mechanic is the only one you can take care of your car

On the downside, you won't be having sex with your pro domme, or engaging in explicit sexual activities (jobs and ingus type activities). If it turns out you are a person for whom femdom and sex are difficult to separate, going with a pro domme will be interesting and fun as an experience but not have the same level of satisfaction. For many people who love pro domination teh separation of these two things is part of the fun