Islabike or Frog. Get the smallest they do, he'll out grow it quickly but he'll learn quicker on a bike that is the right kind of size for him.
The Islabike will retain most of it's value so your friend will be able to recoup 75% of the original outlay later, assuming it remains in good condition. Frog are relatively new but have a similar build quality to Islabikes, but as yet it's not clear if they retain that resale value.
Islabike or Frog. Get the smallest they do, he'll out grow it quickly but he'll learn quicker on a bike that is the right kind of size for him.
The Islabike will retain most of it's value so your friend will be able to recoup 75% of the original outlay later, assuming it remains in good condition. Frog are relatively new but have a similar build quality to Islabikes, but as yet it's not clear if they retain that resale value.