From mainstream (as opposed to custom or niche/boutique) I would name Colnago C50 and it's Extreme derivatives, Pinarello carbon is close to classic (slight hump on top tube?). Cannondale looks very close to classic too. Many others are very slighly sloping (semi compact) like Time, Look etc.
Sloping (or semi-sloping) top tube allows greater flexibility with head tube length to minimise the number of spacers. To me this is the biggest benefit of top tube slope. There are other benefits too but none that I would call overwhelming. It is more about visual effect than many would admit to. To me, full compact frame, such as Giant, does not look attractive, it looks like a girl's bicycle. But I have friends who think classic shape is very boring looking. Each to their own! It wont affect your performance on the road, I can tell you that!
Last year when I was shopping for a new bike I rode both "classic" level top tube design frames, as well as mild to extreme slopping top tube frames.
To me at least, the extreme slopping top tube frame bikes (Trek Pilot, for example) felt very strange under me. Or maybe it just looked strange to me because I have always ridden a "classic" design road bike frame. In any case, I ended up with a "classic" level top tube bike (Trek 2100). It just felt "right" to me.
I came to road bikes from Mt biking so the compact geometry appealed to me. It was similar to me. I am older too and the more upright position keeps my neck in a more comfortable position on long rides. The guys I ride with all have classic designs but they use riser stems and such to give them the more upright position. The sloping tube does not affect the performance on the road to me.
This is any easy question. If you're buying a new bike and getting a full custom fit go for the classic geometry frame. If you're buying a 2nd hand bike or something on sale buy a compact frame because it's easier to make the compromises necessary to get the 9/10 fit.
Compact frames are manufactured to allow manufacturers to make four size frames instead of ten to fit everybody and reduce manufacturing costs.
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