I've got both, and I know that Ronnie Aloha has both as well.
I can't choose one as better than the other, because both of them just sound so different than a tenor. I've compared the PS and Sceptre against a lot of ukes, but neither of them really sound like any of the others. I think it's because the sound is most comprable to other KoAloha ukes. From my experience with KoAlohas, their ukes just have a different tone from other brands, so it's hard to say that it sounds like anything other than another KoAloha. And I own a KoAloha sSoprano, sConcert, and Tenor. And all of my KoAlohas are strung with either worth clears or browns. But all of them sound different.
Soprano: Take the Kamaka soprano sound, then make it slightly less round and full, but give it a lot more punch, and give it more percussive overtones. And you can really push the volume on the KoAloha.
Concert: I love the sound of my KoAloha sConcert. Easily better than the Kamaka concert. More warmth, more roundness, and capable of handling a wider range of dynamics without working too hard. One of the best KoAloha tones, IMO. Easily reccomend this over the Kamaka. I don't own a Kanilea concert yet, but have played one, and it just does not match up to the KoAloha.
Tenor: This does not sound like the Kamaka or Kanilea tenor. It is really different. The Kamaka Tenor is definitely the most "traditional" sounding of the three. And the Kanilea has the most "full bodied" tone. The KoAloha, IMO has a slightly less complex tone than the other two, but is very distinct and boomy. Lots of percussive overtones as well (you don't really hear these with the sConcert), but you can really hit a wide range of dynamics, esp in the upper range, with the KoAloha tenor. I'd probably say that the KoAloha tenor that I have is the most "responsive" tenor of the three. If you want a good player, but don't NEED to have that traditional tenor sound, go with the KoAloha.
Sceptre (Tenor): It's really hard to compare the sound to anything. Yes, it is louder and more focused than the PS as George pointed out. And actually, I'll have to contradict myself, and say compare this tone to a Kamaka concert tone. But with a subtle KoAloha characteristics. It may have sounded different before electronics, but now, the closest thing I can compare it to is a Kamaka concert, but it definitely does not sound like my KoAloha sConcert. It's a more traditional concert sound, not too complex, but with just the right amount of undertones. Probably the most "traditional" sound of any KoAloha I've played.
Pineapple Sunday: Also difficult to compare to anything else. But I'd have to say that the sound is most similar to a KoAloha soprano. Keep in mind that the KoAloha soprano does have a very loud sound. It is just that same type of tone. You don't get the complexity of the KoAloha concert or tenor tone with the PS. This comparison may also be partially due to the fact that I've stuffed the insides of my PS with a Fishman Matrix, and that takes away from the sound. Without the pickup, it'd be louder and fuller. And that is a fact, b/c I've played my wired up PS against a new PS at the shop, and yes, the unwired PS does sound noticibly better. Then again, the PS doesn't quite sound like their soprano. I'd say its more of a grown up soprano, or an adolescent soprano (but still not a concert.)
I've written this all from memory as my ukes are still in their cases right now, and unpacking and repacking would take quite a while, but I've got quite a few hours on all of these ukes.
My main complaint with the PS and the Sceptre is that the ergonomics aren't perfect for me. They're harder to hold than a tenor, IMO. I especially have a problem with the thin bodied sceptre sometimes. And with electronics, it did get considerably heavier (although it also got more well balanced and not has head heavy) I don't want to use a strap, but it looks like FaceMeltingUkulele has no problem with it, so I'm sure I'll get used to it. (Haven't owned it for too long yet)
But basically, there is no better instrument between the two. Both are excellent, and each very unique. They both sound good, and play smoothly. Oh, and you look like a rockstar no matter which one you choose.