Life expectancy favors the Poodle: 12–15 years versus the Cavalier King Charles Spaniel's 9–14 years. For many families, those extra years together are a compelling reason to lean toward the Poodle.

The Poodle needs slightly more exercise (4/5) than the Cavalier King Charles Spaniel (3/5), but neither breed is at an extreme. Both have high to moderate energy levels, so the difference in your daily routine will be modest — perhaps an extra 15-20 minutes of activity for the Poodle.

If you hate vacuuming, this matters. The Cavalier King Charles Spaniel's 3/5 shedding level means daily fur management is part of life.

These two breeds look nothing alike. The Poodle is a medium breed at 18–32 kg (40–71 lbs) and 38–61 cm (15–24 in), while the Cavalier King Charles Spaniel is a small breed at just 5–8 kg (11–18 lbs) and 30–33 cm (12–13 in).

Personality is where these two breeds diverge most visibly. The Cavalier King Charles Spaniel — originally from England — has a affectionate, gentle and graceful disposition.

The Poodle has a slight training edge (5/5 vs 4/5). Both respond to positive reinforcement, but the Poodle tends to catch on a bit faster.

The Cavalier King Charles Spaniel has a slight edge with children (5/5 vs 4/5). Both breeds can do well in families, but the Cavalier King Charles Spaniel's affectionate temperament gives it a small advantage around young kids.

Purchase prices are in the same ballpark: $1,200–$3,500 for a Cavalier King Charles Spaniel and $1,000–$3,000 for a Poodle. The initial investment won't differ dramatically between these two breeds.