Siblings in Polk Audio's Reserve series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Bass | A | Polk R200 50th AE digs deeper - 51Hz against 75Hz. |
| Amplifier needs | evenly matched | Similar sensitivity (86dB vs 87dB) - both want much the same power. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Type | depends | A Passive Bookshelf against a Passive Center Channel - a different job rather than a better one. |
| Cabinet | depends | Ported vs Sealed. Sealed is tighter and happier near a wall; ported digs lower but wants space behind it. |
| Price | B | Polk Audio Reserve R350 is cheaper - $649 against $1,249, about 48% less; arguably a different class. |
A Polk R200 50th AE B Polk Audio Reserve R350
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Polk R200 50th AE is ahead, but only on 1 of the measured areas, and it costs about 92% more. That is a lot of money for a narrow margin on paper - Polk Audio Reserve R350 looks like the sensible buy unless something else about the Polk R200 50th AE appeals to you. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 75Hz anyway, which makes the cheaper Polk Audio Reserve R350 much easier to justify. Think about the whole system, not just the speakers: the roughly $600 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.