Shoes for 18 mo old

Is there any real data about what kind or brand of shoes are best for a
competent but young walker? DS is 18 mos and has been walking for 8
mos. Most of the shoes I see have velcro which I am not too thrilled
about, and many seem stiff and or clunky (fashion over form). Is there
a brand or style I should look for?

He has Robeez and Bobux for inside - I need a substantial shoe for
outdoors, since it is wet here most of the year.

TIA for any input,
-L.