Both are "good brands".
I'd also look for "features" such as switchable mic/line inputs (or mixing), EQ adjustments, etc.
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but the peavey tweeter
is an Rx 14, the spec for that states only 30 watts continuous, 60 program and 120 peak,
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Is that just the tweeter specs? Speaker power-ratings get "complicated". In general, a powered speaker should have matched amplifiers & driver and you should be able to drive it slightly/occasionally into distortion with no damage (with regular program material). ...With constant high-power test-tones you can burn-out tweeters easily.
And wattage is only part of the story. Some drivers are more efficient/sensitive than others and a lower-power speaker with more efficient drivers may play louder than a higher-power speaker.
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people are telling me that if they sound good for
this type of use, they will be HiFi sounding, and will not be so good for
acoustic guitar vocals and speech.
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I don't know what that means... Hi fidelity is a good thing! (But, most home Hi-Fi speakers can't be "abused" and can be more-easily damaged electrically, physically, mechanically, or cosmetically, so they are not good for live use.)
I'd guess either of these speakers will sound great in a good room!
I assume the DSP on the Peavy allows you to EQ to whatever "sound" you like.
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would a 12inch woofer based unit be better sounding
on the guitar and vocals as opposed to a 15 inch woofer based unit, a sub
could / will be added later when crowd grows.
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You can't always generalize, but a 15-inch should put-out more/better bass and it may play "louder".