I do not know if I would call that advantage. Glasscockpit is something you will use your whole career. It is great thing but the possibility to compare was great because I realized how vulnerable I can be without that how many things I take as granted or I could compare different styles of flying.
I will try to show you. As you already fly you will see.
Heading.
I began on a/c with heading indicator working perfectly. You set it after start up, checked on runway and did not have to touch it for whole flight. It was working, all good. And yea, it has heading bug. You set the heading bug and you could see that you are turning. You did not have to remember or so. Nice thing.
Then we had older a/c and you had to correct that every few minutes with help of magnetic compass. No heading bug. "Annoying thing."
Even older and smaller a/c. It was there. It was not working. Magnetic compass. Here we go. You know how "nasty" it is. And you suddenly notice it is not that easy.
And sure. Glasscockpit. No correction, works wells, shows your heading as "123", heading bug. "Get of my way, I'm Airbus." style.
Glasscockpit could set target altitude. Easier, comfy. Tells you when you deviate too much. It shows you wind or wind components if you want. Transponder is automatic, another thing you "do not have to care".
On the other hand, flying IFR on some of those older a/c was quite pain. More workload, sure why not it is training but it did not matter how much you try it was messed up. Well it was not that bad, of course but...that one ADF still causes me nightmares.
You will forget, really fast, that flying is not that easy and you can lose all those things.
But I do not say go for older a/c. I just share my feelings about flying different "generations".