The Rollei 35 series were originally designed for Edixa, and the design was inherited by Rollei. As a high-performace pocket 35mm camera it was first made with a 40mm Tessar lens, some earlier examples had Xenars. When manufacture transferred from Braunschweig to Singapore, the Tessar model became 35T as the higher-spec model with Sonnar lens was introduced as the 35S. Later on both acquired more advanced metering systems and became 35TE and 35SE respectively.
Rolleri also made a simplified version, with Triotar lens and no slow shutter-speeds. The meterless one is C, the B has the selenium meter. Later on the B acquired a better meter with LED readout and became the 35LED.
Note that batteries for those battery-dependent models are no longer widely available so some improvisation has to be factored in, if you want to make them fully functional.
The Rollei XF35 and its Voigtlander VF135 twins are very different creatures, more like the generic Japanese CRF compacts of its days. The Sonnar lens is still very competent and the shutter speed tops at 1/650s (if memory serves), and is programmed to link to the aperture. Unfortunately it also requires the dreaded PX625 mercury battery so have to get Weincell or the CRIS adapter.
Very few pocketable cameras have rangefinders; if you like something more modern, the Olympus XA (original model) might be an idea. But then, if you like something with more metal and don't mind the weight (the Rollei 35 cameras are quite weighty), a very compact camera would be the Super Solinette by Agfa; a folding camera. A little tinny perhaps compared to the others but very sturdy and inexpensive, make sure you get one with a Solinar, or at least Apotar lens; I feel that they actually made a version with a Solagon lens and that would be the pick of the lot but it would be rare, more expensive and bigger.
As late as the 60s, if memory serves, Certo continued to make the Super Dollina CRF folding camera and sold them in the US as well, normally equipped with Tessar lens. Might be a long shot to find one, but worth it I'd imagine, that is if you do not mind having a larger camera made completely out of metal that is!