Here is how these two tents compare on the numbers. They score within a hair of each other, so it comes down to the details below.
| Marmot Limelight Ultralight 3P | Big Agnes Copper Spur UL3 | |
|---|---|---|
| GearScore | 78✓ | 77 |
| Capacity | 3 | 3 |
| Packed weight | 52.8 oz✓ | 54.0 oz |
| Floor area | 40.9 sq ft | 41 sq ft✓ |
| Space-to-weight | 12.4 /lb✓ | 12.1 /lb |
| Peak height | 46.5 in✓ | 43 in |
| Doors | 2 | 2 |
| Vestibules | 2 | 2 |
| Price | $589✓ | $650 |
| Type | Ultralight | Ultralight |
Highlighted cells mark the better spec: Limelight Ultralight 3P in blue, Copper Spur UL3 in amber. A blank spec is never counted as a win. GearScore is the overall rating (0 to 100); re-weight it on the full tent comparison. Prices are current MSRP.
The Marmot Limelight Ultralight 3P against the Big Agnes Copper Spur UL3 is a study in priorities. They are close enough that this really is about which handful of specs you weight most.
The Limelight Ultralight 3P is 1 oz lighter, better space-to-weight, and taller (46.5 vs 43 in peak). The Copper Spur UL3 is more floor area (41 vs 40.9 sq ft). Their GearScores land within a couple of points (78 vs 77), so neither runs away with it.
Pick the Limelight Ultralight 3P if you care most about low weight and space-to-weight, which makes it the better call for counting grams on long miles. Pick the Copper Spur UL3 if floor space matter more to you, or you are focused on comfort and room to move.
The Marmot Limelight Ultralight 3P. It is 1 oz lighter than the Copper Spur UL3.
The Big Agnes Copper Spur UL3. It is more floor area (41 vs 40.9 sq ft) than the Limelight Ultralight 3P.
They are nearly tied at 78 and 77 on the default algorithm, so re-weight the score to your own priorities to break the tie.
It depends on your priorities. Go with the Limelight Ultralight 3P for low weight, or the Copper Spur UL3 for floor space. The spec table above shows exactly where each wins.