I also own the tirra sandal and I find that one way more comfortable than these but these are much cuter.  I got the 7.5 in these but could have probably gone with the wides (they weren't available when I purchased).  These are not as supportive as the Tirras and they rub by the baby toe where the straps join.  They also run small in width but true to size in length (I am a 7 in Tirra).  The suri taupe color is very nice and matches everything.