I'm certainly no expert but IMHO it depends on whether you are practicing for fishing, distance or cleanliness - and of course they are all related but I believe you need a different approach for each.
If I want to practice up for a trip to the Thompson, I will be using an extended belly line and the rod that is matched for that line - the Thompson, Salar, Steelhead Specialists or the 1510 Custom or Expert. Lines from Grandspey XLT length down to Carron / Wulff length or best of all a custom speydriver borrowed from Dana. I would concentrate on being solid regardless of the bank and wind, only a switch cast here and there to get started but all else working casts with angular changes.
If I am going to be bush-whacking on the Sol Duc for natives I will be using stealthy short spey heads and Skagit lines and the Skagit Specialist, or my old standby the 1308SP Custom while I feel bad leaving the sweetie 1308 Expert in the rod case because it's so nice to cast and fish and doesn't get the respect it deserves for being such a fine rod. I wouldn't try to go lighter especially in early spring as I've wrestled with giants in that river with 7/8 wt rods and lost. But my point is to tune into the Ed Ward mentality to be best suited to the task.
For distance casting, which probably has the least to do with fishing of the three, I would go big and long, obviously. I am not prone to spend much time in this pursuit.
Most often I practice for cleanliness, technique, consistency. I would practice with intent to fish more often but since the 3000 mile relocation I am more prone to work on mechanics lift to finish, and aspire to be a clean caster well-rounded rather than a musto man. I certainly have work to do
I like to practice with all configurations but I enjoy a little cool-down period after casting big with a very light and gentle rod like the 1306 Expert and the Hardy 8/9 or the Rio WC 5/6. Fingertips only, finesse. It seems to improve my mechanics with heavy rods and lines afterward.
Results may vary
