Looking to upgrade to a 90hp.

Looking at:

1987-1997
Mercury 90hp.
Weight 265 Lbs.?

1984-1995
Yamaha 90hp.
Weight 223 Lbs.?

Both are Re-man's, currently rigged with Yamaha
Which has been great and I have nothing against
It or know much about. (Came with boat)

Just always been a Mercury fan.
So if I were to upgrade in power now
Would also be the time to re-brand.

So for the big picture, I would like to know

The pros and cons of both.
Parts availability of both long term.
Etc.etc. etc.

Look forward to your thoughts