A soft case is lighter; a hard tube handles compression and impact better. Check 1×1, 2×2 or 2×4 capacity against the actual number of butts and shafts, not just the label. Add a protected compartment for extensions and tools, and never leave a wooden cue in a hot car. Links: Cases, travel.
Before buying, match these checks to your playing goals and ask the seller to confirm the exact model specifications.