Glazing - triple glazing worth doing?

[Tahiti]

We have double glazing which is on its way out (panels with moisture on the inside and one not shutting properly) so we're planing to replace it.

As with everything, I am thinking of upgrading. Triple glazing sounds like the right choice (we are on a semi busy road and some of the neighbours like to have parties too), but thoughts/advice appreciated on:

Double or triple glazing? Why?
What spec to go for?
Any recommended suppliers/fitters?

Equally, while we are at it, we may as well look to do the front door and the patio doors (maybe swapping to bi-fold doors). If it's worth looking at a specialist, any suggestions would be appreciated.

[Tahiti]

The thing that appears a negative of the triple glazing is the potential reduction in light.

[Tahiti]

Interesting.

I hadn't even considered keeping the existing frames to be honest. Worth a bit of thinking through.

[Tahiti]

Any recommended suppliers (either national or in Kent) for frames and glass?