@arafiq
"...I described above with the more common tube pre + SS amp combo? If you have compared both, which one sounded better to you?"..
Having tried all scenarios mentioned above, I’ll mention results can vary quite a bit when you start intermixing different type, brand, and power amplifier outputs. Getting attenuation right without introducing other components can be tricky. There is something to be said about selecting components originally designed and voiced to work together.
In my case, I locked in on a specific tube preamp I really liked (starting baseline), and then tried different amplifiers (Tube and SS) over several years. Also bi-amped the tube amp(s) for top-end and solid state on the bottom end as you described. After I was done screwing around too long, went back to two mono tube amps (same, brand, type, power) to drive each speaker individually. I liked the tube preamp and class A/AB ss stereo amp combo 2nd best.
Kiinda like asking what vehicle to buy, and more info is needed to understand how you plan to use it. It really depends on what you are really trying to accomplish and what starting gear you are working with for your SS amp, and go from there. A lot of people do use tube preamps to change the sound of how a SS amp sounds. Once they get a taste of what good "tube" sounds like, curiosity sets in further about tube amps... :). Next a series of questions develops about what integrated tube amp they should buy. Rinse and repeat. Good Luck.