Originally Posted by
IceTee2
... , is there any advantage/disadvantage to combination shift/brake units over separate units? ....
If two parts can be installed so that they both feel like they are both in the right place, that works. If you can't get the two parts to feel right, you will know it.
I had to replace a combination unit when the shifter gave up. But I bought a used one for a buck, so buying a combination one did not cost extra.
Speaking of used parts, many communities have bike coops or bike charities where there are bins of used parts that you can buy. If you have trouble finding the parts you want, see what there is locally. I have bought used parts that are on at least five of my bikes. I think my road bike that I bought new three years ago is my only bike without any used parts on it, but I bought that as a complete bike that did not need anything other than water bottle cages.