You'll notice the size difference immediately. The Great Dane stands 71–86 cm (28–34 in) tall and weighs 45–90 kg (99–198 lbs), making it considerably larger than the Bulldog at 31–40 cm (12–16 in) and 18–25 kg (40–55 lbs).

The Great Dane needs slightly more exercise (3/5) than the Bulldog (2/5), but neither breed is at an extreme. Both have moderate to low energy levels, so the difference in your daily routine will be modest — perhaps an extra 15-20 minutes of activity for the Great Dane.

Both breeds cost a similar amount upfront — $1,500–$4,000 for a Bulldog versus $1,000–$3,000 for a Great Dane. Where the real cost differences emerge is in ongoing expenses.

When you live with a Bulldog, you'll notice their docile, willful and friendly character in everything they do. A Great Dane, by contrast, shows a friendly, patient and dependable nature.

The Great Dane has a slight training edge (3/5 vs 2/5). Both respond to positive reinforcement, but the Great Dane tends to catch on a bit faster.

Both breeds shed at the same rate (3/5), so fur management will be identical for either choice. Expect a moderate amount of loose fur from both.

Both breeds score 4/5 with children, making them equally suitable for families. Either breed would make an excellent family dog.

Both breeds have comparable lifespans — 8–10 years for the Bulldog and 7–10 years for the Great Dane. You can expect a similar length of companionship from either breed, all else being equal.