Buying into Vintage TT's has a broad appeal.
There can be a very impressive performance achieved for not too much monies needed. It can start at a simple overhaul/service through to a swap out of original supplied parts, from a Plinth and onto the Mechanical Parts and Electrical Parts.
A DD TT can be the better option when the Electronics and Speed Stability are the Goal, as these are already well catered for in certain models, and a add on ancillary to improve a Belt or Idler Drives Speed Stability can in cases cost as much as overhauled/serviced DD TT.
Belt and Idler Drive TT's are more accommodating of mechanical parts being exchanged such as a Bearing Assembly and Platter is desired.
With the introduction of a New Plinth Design, the types of Tonearm to be used can become extended in the options.
The above is my method for a TT and I have been loyal to it for nearly 30 years. My first Idler Drive Bearing Mod' and Dedicated Plinth was completed in the mid' 90's.
I am without a TT Source in use at present, and am happy to be able visit friends homes and share in their Vinyl Source. Buying a Few Albums occasionally for the visits, adds to the enjoyment, is usually very well received by the system owner, and builds on a Vinyl Collection.
The rush to purchase is not necessary, as there are vinyl experiences available on the Vintage Set Up. I'm sure your friend will be quite interested in supporting you through to your choices made, even if a Streamer is the option selected as the new acquisition.