Many collectors prefer editions that include the original illustrations from the Strand Magazine (often by Sidney Paget) to capture the true Victorian atmosphere.
The HarperCollins edition is praised for its high graphic quality, sturdy hardcover construction, and comfortable font size for reading.
Be aware that single-volume "Complete Works" can be very "hefty," sometimes weighing 4–5kg, making them better as centerpieces than portable reading material. Where to Download (Legal & Free)
Readers often describe complete editions as an "absolute steal" for the price, providing the entire Holmes universe in one place.