Either would be an excellent choice, but the Scott will likely be a more demanding unit in terms of maintenance, being about 45 years old. If the Scott is original there it could likely stand for some improvement via an overhaul (refurbish). From a good tech who knows what they're doing that will cost a chunck of change with the parts. You could also spend more and purchase a unit already refurbed. Also the biasing procedure on a Scott is going to be a bit more involved than on the Jolida which is fairly straightforward. I have no experience with the newer 707a you mentioned, but can say that the 302b and the 502b both are outstanding amps for the money in every respect. They also leave room for future upgrading of internal components and performance. Other than that they'd be plug-n'-play with a simple bias procedure. I believe your considerations in the vintage Scott's are EL84-based pentode designs. I've heard the 299a and it is a very sweet sounding amp indeed. At 17watts it does not have the muscle the Jolida's I mentioned to, but the pentode design doesn't seem to give that away much. Jolida's 102B would be a closer sound to the Scott, I'm guessing (have not heard one though), than the bigger-bottle amps they offer. I'm pretty sure most of Jolida's stuff is a push-pull design (someone correct me here if I'm wrong). The Jolidas I've owned and heard have had a bit of a rounder fuller sound to them than the Scott 299a, which tends to sound a bit more focused and dynamic to my ears. All are pretty versatile amps with the Scott requiring a bit more efficient speaker. All represent great value for the money, but, again, with a limited budget, and a college-student's schedule, go for the Jolida for a more trouble-free route unless you are a hands-on kind of person who likes to tinker and knows electronics.
Marco
Marco