The Hindi script is easier for a foreign learner to deal with, because it more accurately maps to the phonemes of the language. So it's possible to "sound out" an unknown Hindi word from the written form, and get it fairly close to correct. With the Urdu script, this is more difficult, as many of the vowels are left unwritten or under-differentiated.
(For a trivial example, is اس the word /ɪs/ "this" or /ʊs/ "that"? In Devanagari, they're clearly different, इस vs उस. Urdu script can distinguish them, by adding a diacritic to the ا, but it's usually omitted, leaving the reader to infer the intended word from context. For a native speaker, that's not usually a problem, but for a learner it can be an added challenge.)
On the other hand, I suspect the Urdu script might be faster for an experienced writer to use, as there's a beautiful simplicity and smoothness to its cursive forms, compared to the relatively complex shapes of many Devanagari letters.