Is my nostalgia the same as yours?
My first computer had an AWC-made keyboard with Futaba simplified linear switches. Those switches have a bizarre property where bottoming out is virtually silent, but the switch makes a loud sound on return. The end result is that the keyboard sounds "lagged" — you hear a noise a fraction of a second after every keystroke.
I have no idea what I made of that back in the early 90s, but now it's plain annoying (I still have the same type of computer).
If this is your first mechanical keyboard, what are you seeking to be nostalgic over?
As to your other questions — neither of those keyboards is programmable. The Matias Tactile Pro 4 should sound a lot louder, and the click sound should be a lot more satisfying, but I've yet to use Matias click switches in person. Honestly, I'm tending to think that non-click Alps switches sound better, something like this:
Alps switches have a deeper sound than Cherry switches, and since Matias don't sell a comparable switch (undamped linear or tactile) you won't get that sound from anything on the market that I know of. (Not even a linear Alps clone Ducky, as those got discontinued.)
I got used to the sound of Cherry MX Blue in the end, but nothing beats non-click Alps for that nice deep sound.
[wiki]Alps SKCL/SKCM series[/wiki], [wiki]Alps SKBL/SKBM series[/wiki] and most [wiki]Alps clone[/wiki] switches differ from [wiki]Cherry MX[/wiki] switches in many ways. One being that Alps switches went for "positive pressure": the contacts are forced together under pressure; [wiki]Omron B3G-S series[/wiki] and most clones are built the same way. Most other metal contact switch designs allow the contacts to close under their own power, which may provide for longer switch lifetime. The internals of Alps SKBL/SKBM and the [wiki]Matias switch[/wiki] series (which are very similar) and Cherry MX switches are very different inside and they also feel very different.