Both layering systems have their advantages and disadvantages. I think we just need to answer some questions about ourselves, how we function in the mountains, our level of exertion, what kind of trips we go on, in what conditions. Do we participate in alpine trips off the beaten path, multi-day trips, in all seasons? I think that a bomb-proof set up must include both top and bottom hardshells.
If your concern might be wind protection and some water resistance, softshell jacket will do. I think softshell pants are very versatile in all kinds of mountain conditions, but I still bring light hardshell pants with side zippers (a must) when the weather gets nasty.
The softshells were developed when people expressed interest in clothing that was windproof as well as somewhat water-resistant and a little breathable. It has taken at least 10 years of outdoor industry's effort to develop softshells that would be all that. That effort still has not produced a garment that would do it all.
So in the absence of totally bomb-proof softshells, hardshells still rule. BTW Shoeller fabrics are fantastic, especially on pants.
So ask yourselv how will you be using the product, in what conditions, in what seasons and the answer might be easier to arrive at.
And if you feel that softshell top is the way, by all means go and buy one. But understand, it is not likely to answer all your needs. The post
above by WyomingSummits says it all.