I've never used the Apollos, but have two pairs of the Twin Jets, one size for diving with a wetsuit and neoprene booties and another size for diving with a drysuit. One's blue and the other's yellow, so they are the same composition as the ones you are looking at. The main advantage of being slightly positively buoyant is that they don't sink if you let go of them (been known to happen on shore dives when something odd happens). It's not really noticeable when swimming.
I have never had a problem using these fins snorkeling, swimming at the surface, swimming in current, or swimming at the surface in current. They are actually very powerful fins - you just don't feel it in your legs the way you do with paddle fins. The first time I used them, it felt like I wasn't going anywhere, because I did not feel the tension in my legs that I felt with the Mares Quattros I was using. But when I tested them head-to-head, it was clear that I was getting better results for less effort with the Twin Jets. Use a short, quick flutter kick for maximum effect. I don't know why you can't get the black Twin Jets, but if you like a stiffer fin, that would be a good alternative.
Now, despite my defense of my Twin Jets, if you liked the Apollos better, that's probably what you should get. Any differences there might be between the fins are probably less important than making you comfortable with your gear. If you feel good about it, you will be a more comfortable and confident diver, which is what it is all about. Heck, if having pink, purple, or green fins makes you feel better, go for it. Personally, I think a lot of the discussion you have heard that led you to ask your questions is off-base (particularly the part about Twin Jets not being good in current), but who cares other people think. If it feels good to you, it's the right thing.
I have never had a problem using these fins snorkeling, swimming at the surface, swimming in current, or swimming at the surface in current. They are actually very powerful fins - you just don't feel it in your legs the way you do with paddle fins. The first time I used them, it felt like I wasn't going anywhere, because I did not feel the tension in my legs that I felt with the Mares Quattros I was using. But when I tested them head-to-head, it was clear that I was getting better results for less effort with the Twin Jets. Use a short, quick flutter kick for maximum effect. I don't know why you can't get the black Twin Jets, but if you like a stiffer fin, that would be a good alternative.
Now, despite my defense of my Twin Jets, if you liked the Apollos better, that's probably what you should get. Any differences there might be between the fins are probably less important than making you comfortable with your gear. If you feel good about it, you will be a more comfortable and confident diver, which is what it is all about. Heck, if having pink, purple, or green fins makes you feel better, go for it. Personally, I think a lot of the discussion you have heard that led you to ask your questions is off-base (particularly the part about Twin Jets not being good in current), but who cares other people think. If it feels good to you, it's the right thing.