I can speak authoritatively on the subject of Hugh because my son is Hugh and he is mega cute.
We found that people either really enthused and loved the name or went, "Hugh, Right".
What is great is that it is traditional but not over popular right now and the famous Hugh's are all quite decent blokes (Jackman, Fearnley -Whittingstall, Huw Edwards (except for the funny lip sneery thing), Grant ( again forgetting misdemeanours with prozzies).
I love it (obviously) but will tell you some thoughts I have had on it since naming.
When you want to be stern, it is hard to be stern with a one syllable name.
We have tended to lengthen his name jokingly to Hubert, Hubes, Hughie. I had not heard the "to hughie" connotations until after he was names, which I think are american anyway and actually do not bother me. I have shocked myself by even calling the poor lad Hughie Pooey sometimes which I must try to stop!
Personally I think Hugo is a lot posher than Hugh and for us was not an option for that reason.
Anyway ringing endorsement from me!!
I am pg with number 2 and if a boy will probably be Alfred but Ralf has got me thinking now...
Good luck.