Sorry for your DH loss.
Depends on your 'culture' - if you are of (eg) Irish descent, it will be usual to have open coffins and wakes. Ditto when I flew out to Canada - which phased me awfully _ couldnt get my head round the amount of 'funerals' for one person! There was an open day (open casket viewing by Joe Public), a few days later there was a cremation and a few days later an ashes committal. The same people were expected to attend all threee services on different days.
Personally, I was quite distraught at viewing my mothers body (but I was 31 weeks pregnant) - on the other hand when FIL died, DH spent every afternoon at the undertakers. SO what worked for him did not work for me.
I think it is very much a personal thing; it depends on the maturity of your children and how you have dealt with death within the family.
O/T I have always taken my children to the funerals of people who, shall we say, weren't that emotionally connected to them - thats just preparation for dealing with the service etc when it is someone close. I never attended a funeral until I was 20/21, and it was a burial. The next funeral was my own mother. I was not prepared at all.
Maybe the trigger with my mother was the fact she had been in hospital for a week and looked ill. She was an extremely well groomed woman. No one mentioned there are make up artists for the deceased. So seeing her ill kempt after week courtesy of the NHS was perhaps the 'shock factor'. However, saying that, I was in the room but behind the curtain when she died and I wasnt traumatised by being allowed to see her 10 mins after she died.
I do think funerals are important, it is a 'respect' thing in my eyes. Others will disagree.
Death is the natural conclusion of the life cycle.
I think it's a judgement you have to make as a family and not ask randoms on the internet.