I have a wired Cateye Strada Cadence on one bike and a Strada Wireless on another. Both work fine. I have not had any interference on the wireless Strada, and it works as well as the wired version, in my experience. If I were to do it again (and my soon), I would go wireless on both. With separate speed and cadence sensors, the wired Strada I have puts a lot of zip ties on my chainstay, and I'd rather just simplify it.

Keep in mind that most basic wireless computers will require you to use a fork-mounted wireless sensor. This won't do you much good on a trainer, if that's a concern. Cateye's wireless cadence models combine both the speed and cadence sensors into one unit and put them on the chainstay, so you can use it on a trainer and forgo having zip ties on your fork.