Verdict: The Leica DISTO D2 is more accurate at long range and the better tool for estimating and professional layout; the Bosch GLM 165-40 is the for general contractor and trade use where the accuracy delta rarely matters.
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Winner: Bosch GLM 165-40
Spec-by-spec comparison
Bosch GLM 165-40
Leica DISTO D2
Max Range
330 ft
165 ft
Accuracy
±1/16 in (1.5mm)
±1/16 in (1.5mm)
IP Rating
IP54
None
Bluetooth
Yes
Yes
Floor Plan App
DISTO Plan
MeasureOn
Price
~$185
~$119
Bosch GLM 165-40
What works
±1/16 in accuracy to 330 feet — double the Bosch's range
IP54 rated — dust and splash protected for active construction sites
DISTO Plan app is purpose-built for floor plan sketching
What doesn't
$169-199 — $70 premium over Bosch for features most contractors don't need daily
DISTO Plan app overkill for simple measurement logging
Smaller display than GLM 165-40
Leica DISTO D2
What works
$99-130 — $70 cheaper than Leica DISTO D2
165-foot range sufficient for residential and most commercial use
Larger display, easier to read in bright outdoor conditions
What doesn't
No IP rating — not suited for dusty or wet site conditions
165-foot range limit constrains large commercial measurements