You may wish to make such a choice based partly on the efficiency of your loudspeakers and the size of the room. With average efficiency speakers have a sensitivity of about 90db for one watt delivered, and my speakers having lower sensitivity at about 87db for one watt, I decided in favor of 200w/channel just so that I could be even with average speakers at 100w/channel. (Doubling the power is results in about a 3db increase.)

One reason for having more power than something like the five to twenty watts absolutely needed for most listening, is ‘headroom’ for sudden, very short-term transients that require an upswing in voltage, not to deliver sustained power, but to rise and fall as required without overtaxing an amplifier’s capacity. This keeps the output clear of low-level annoying audible distortion as well as higher level distortion that could damage loudspeakers.

Some may find it hard to believe, but speakers such as mine, driven at close to 50 watts with headroom to 200+ watts, would produce no more sound than Soundhound’s very sensitive mid-to-high range horns using about half a watt with headroom to five watts. In fact, by this measure, Soundhound has more high frequency transient headroom than I do.

I would say that a good, clean, ‘strong’ 100 watts/channel, such as Outlaw provides in the 7100, is likely to be plenty for almost every need, but a strong 200 watts/channel is tempting, isn’t it?

I would say that the sonic quality of both amps, which seems to be your primary concern, is excellent.