The most consistently recommended kids' bike across Reddit communities. Lightweight aluminum frame builds confidence fast, and pedals can be removed to use as a balance bike first.
If you can stretch the budget, get the Woom. It's the bike parents recommend over and over again, and kids who ride it progress faster because it's actually light enough for them to control.
“I got a Woom 2 for my 4 year old. It's built very well, it's lightweight (child gains more confidence in control), you can remove the pedals and”