Siblings in Revel's Architectural series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Amplifier needs | A | Revel W553L is more sensitive (90dB vs 88dB), so it goes louder on the same amplifier. |
| Headroom | A | Revel W553L takes more power (150W vs 120W) - more in hand in a big room. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Type | depends | A Passive Center Channel against a Passive In-wall - a different job rather than a better one. |
| Price | A | Revel W553L is cheaper - $545 against $610, about 11% less. |
A Revel W553L B Revel W363
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?
Revel W553L is the easier recommendation: it leads on most of the measured areas and costs less. Take Revel W363 if its size, looks or fit in your room suit you better. If your amplifier is modest, vintage or valve-based, Revel W553L is the safer partner - the other will want more current or more watts to sound its best.
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.