Most of the new lines have welded loops on the ends, so I suggest that regardless of the brand. A few that do not have welded loops are 000wt, 00wt and 0wt lines. What I don't like about the older style that do not have welded loops is the inner core can absorb water and make your line sink.
The welded loops make it very fast to connect a leader.
You may want to consider getting a furled leader with a steel ring in the end to attach your tippet to. Traditional leaders you have to do surgeons knots and each time you make a new one...it gets shorter. With a furled leader and a steel ring your leader stays the SAME and never changes. You can do a quick Orvis knot or Davy knot and you are fishing again. I have had one for 4 years and going strong. I don't think it will ever wear out. It is on a 5wt rod and I can float a #26 dry, so they are not an issue on sinking tiny dries.
What I can tell on expensive lines is they usually have less memory vs a cheap line. With that in mind, Cabela's Prestige lines are on sale for $29 and they have a cheaper line that is normally $29. Those will last for years. Unless you are dragging through a parking lot and don't wipe it down, they should last.
The Shark Skin line by 3M is really sweet and cast great. A GPX series is actually a 1/2 wt heavier but they hide that (same for all mfgs) since some faster action rods are harder to load...so a 5wt line is actually a 5 1/2wt line to load a 5wt rod. Some will even go a full 1wt heavier so put a 6wt line on a 5wt rod. Definitely never go lighter on your line than the rod. Again, all rods have different speeds so it is hard to say what the best line is for that rod.
Dual tapers are easier to roll cast vs a WF line is more difficult to roll cast. So if you have trees in your back cast a lot, you may want to consider that option. Or if your reel has extra spools, consider 2 lines for options on the streams.