Personally I would never buy someone else's project. Its going to be a mystery box and who knows what was done and how well it was actually done. Boosting your current car you will know exactly what was done and would know what parts were done to "that's good enough"; where as in the other situation you have no idea what good enough was for the prior owner.
Unless your current car has some issues AND you can get a good deal on the other car (enough to deal with the problems that are sure to pop up) it's generally a bad idea to buy another car.
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