I personally like the Rio Outbounds a little more than the Streamer Express but the Streamer Express is more popular with customers, possibly because its a little lighter so casts more like a standard fly lines. The Rios are more of a shooting head so takes a little different technique. I think the outbounds coil less, chad says the same about the SE, so take that for what it is worth.
Basically there is no line which won't tangle _ the more line you have lying on the deck, and the more movement it gets the more it tangles. There isn't a solution, though the least tangly line I reckon is the 50' head Galloup line with the very thick running line.

You know we spend a lot of time discussing flies and design, I like building in a lot of wiggle and that side to side dart, but still one of the most productive flies is the old double bunny which has SFA action really on a fast strip. I've probably settled on probably 8 flies (including color + weight variants of the same fly) I have faith in and fish hard, plus maybe 6 others which come out occassionally. But since I'm ocd on flies my box has way more variety lol.

But typically as fly fisher we focus on the easily addressed issues like changing flies rather than the tougher issues of how we actually fish them presentation, where you cast, angles, retrieves, boat positioning and speed etc all have a much greater effect. And number one is showing your fly to fish that are hungry, which basically means lots of casting into the right water.

This thread needs a pic or two, Ben Levin and I snuck out for a couple of hours this week, that's a Galloup Tan Dungeon