KCee
I guess I won't be trying the Bridgestone anytime soon. On a lark I went to the Snell site and their Black Friday sale had the MTB-X Optic yellow 5 dozen value pack available for $129.95 and free shipping. I went ahead and ordered one so I should be all set when golf season resumes for me, probably in about 4 months. 
The most visible golf ball
JoeHatesSnow but I tried the yellow Snell MTB-X this fall and I have to say it might be better.
IMO it is a better ball.
On color everyone is different. I can't see red at all and orange used to be OK but I won't play a matte ball MGS cured me of that. That Crystal that Don posted looks good. I think Volvik Crystal's are harder higher compression 3 piece so that's good for distance.
scotts33
I think it probably is as well, Scott. I didn't really have much interest in trying them until I read some reviews about the balls and one mentioned Dean Snell was the creator of the TaylorMade TP LDP Red ball, which was probably my favorite ball ever. That prompted me to try the MTB-X. I have to say it plays very similar for me.
Dean knows his stuff on the development teams on many great balls that have been brought to market. I believe Snell's made in Korea same as ProV1's. Plus Dean is really a hockey player in the golf industry. 
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KCee Might have to be white though as they apparently never have stock of the yellow.
I bought two dozen MTB - X yellow a few weeks ago from their website. I have both in the optic yellow and the white. My current fav balls. I was playing Volvik Vivid in the yellow and orange. Both the Snell and Volvik Vivid "yellow" balls have kind of a greenish tint to them and you can tell the difference from them to most other yellow balls at a distance.
Years ago I played the Maxfli Noodle "Ice" ball a full season. They came in lots of colors. My fav were the bright pink ones. Very easy to see. They also made a grape colored one that you couldn't hardly see in the air or on the ground.
OG Snell MTB is the GOAT. Still have a dozen! I hope he re-releases at some point. I know it's unlikely but ya never know!
ode
None of the current lineup is similar enough? That seems weird...
JoeHatesSnow the black is similar but not as good....not as much spin into the green, notice it more on those partials, chips and pitches! And the MTB is a tad longer. Black is good but not quite MTB good. Haven't tried the MTB-X to compare....likely next year!
ode
Maybe MTB-X is the one for you then. I have been using Z Star for a long time now, nothing I tried could touch it for me but ProV1 X and I wasn't going to pay for those as Srixon would always have a deal at some point. Plus I got used to yellow. The Snell spins just as well for me but still seems better in the wind for some reason than the Srixon. It also seems to be longer off the driver, and as Rickochet mentioned the color is a little brighter yellow-green. I will do some more comparison in the spring as I still have some Srixons left but I feel like the Snell has dethroned the Z Star for me.
The z star has always been short off the driver for me.....otherwise really like how it performs in every other category.
I'm not going to a high visibility ball. I can only imagine seeing the ball, shining up at me in all its vibrant glory, at the bottom of the pond, mocking me.
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Here's one for Spuzz.
Rickochet Sadly - that is my wife's current favorite ball and in that color. Happily, she seems to hit it better than any other ball she's ever tried.
I play both the Red-ish and Neon Vice balls, I find them both easy to read but does require an adjustment the first couple of time playing.
My whole thing with colored balls is being able to see them in flight. I like matt green. I have been playing Zero Tolerence green and love em. Bought a glove( also great, one size fits all and I have big hands) and it came with 2 balls and some tees. Ball plays great and I ordered another glove and a dozen balls.
If I tried the blue ones I'd need about 50 of them to get through the round as I'd never see them.