West from Salt Lake, which line along the lake is busier?

[train2]

I will be in Salt Lake City soon. West of Salt Lake City are two routes, the SP line across the Salt Lake causeway and the I guess its ex-WP line around the southern end of the lake. Which line is busier? And what would be a average train count on each? Do they do anything like directional running? Which line has better access?

I have thought about heading west into Nevada to the point they join. What is that location called?

[Backshophoss]

Both UP's Lakeside sub(from Odgen)and the Shafter Sub(from Salt lake City via Wendover) meet at Alazon (CP) RV604
about 4 miles west of Wells Nv ,then it's double track to Elko then directional running(as double track)west to Weso,
5 miles east of Winnemucca.
Not sure of current traffic level on the route except for Amtrak's #5 + #6 the CZ.