A few people have asked me if it’s better to go for counselling as a single person from a marriage / partnership or as a couple. 

I think this. 
With counselling, you’re growing. 

It’s like a constant workshop on you. 

Like a little class on your personal development every time you go. 
And I feel that if you go alone, it’s great. 

But it’s also likely, that you’ll be developing hugely. 

And in a direction that isn’t parallel to your partner. 
Even if you both are working on your careers, not your marriage / partnership, there is still huge development happening there. 
So in short. 

I’d recommend going together,

It’s a journey that will certainly make you a significantly different person over time and you’d rather that evolution be with your partner than without.