I never used to like serged as it kind of dug in to baby's legs when she was smaller but then she is very tiny but on smaller non-bulky nappies I find it can be a better fit between the legs. I still prefer the look of t&t though.
More personal preference then it seems? I've ordered them all Serged, might change and get one t&t and then I'll know which I prefer! I do have a preloved DnF which is turned and top stitched but Edison hasn't worn it yet!! Custom orders are kinda stressful eh?!