I have tried various Topre-switch (Leopold FC660C, HHKB Pro 2, HHKB Pro 2 Type-S, RF 87ub 45g, and RF 87ub 55g) or hybrid Topre-switch (CM Novatouch) keyboards.
I liked the feel of the FC660C, but I gave it away because at the time there was a lack of replacement keycaps and I didn't quite like the layout.
The main selling point of the Novatouch is its hybrid switches that use Cherry mx keycaps on a Topre switch. I like it better than any Cherry mx keyboard I have tried, but for the Topre experience, I prefer the RF 87u or HHKB Pro 2.
My favorite form factor is 60% and the HHKB layout is inspired; I now remap all my keyboards to something as close as possible to a Mac/HHKB layout. I didn't like the feel and sound of the Type-S as much as I had thought I would. It gives the impression that the sliders are wrapped in tissue paper. On balance, I prefer the hollow thock and clack of the standard HHKB Pro 2.
The sound and feel of the RF 87ub 55g is my favorite, with the 45g version a close second. I have not tried the silent versions of RF keyboards, but the standard versions are quieter than the HHKB Pro 2 and quiet enough that I do not feel compelled to get a silent version or to do a silencing mod. The plate-mounted switches in the RF provide a solid sound and feel that I like.
Based on all this, my favorite keyboard would be a HHKB Pro 2 with plate-mounted 55g Topre switches. It is possible to do a dome swap to get 55g, but for plate mounting, I would have to wait for someone to produce this new keyboard. Given that this presumed ideal keyboard does not yet exist, I put both the RF 87ub 55 and the HHKB Pro 2 into my keyboard rotation.
For the OP's choices, you need to decide which you value more: the 60% form factor and great layout of the HHKB or the more conventional layout and arguably more solid sound and feel of the RF. In my case, I like the HHKB layout so much that I use Karabiner software on my Mac to remap the RF to something as close as I can get to a Mac/HHKB layout.
At the moment, I am typing on a KBP V60 Matias Click Mini Keyboard and enjoying it very much. I've remapped it to a Mac/HHKB layout, and the sound and feel is akin to another favorite of mine, the IBM Model F XT keyboard.