At this point most studies agree that GS has a more comprehensive coverage than Scopus and WoS, and includes the great majority of the documents that they cover

Gold open access based on APCs has a number of potential advantages. It would scale with the growth in research outputs, there are potential system-wide savings, and reuse is simplified. Research funders generally reimburse publication charges, but even with broad funder support the details regarding the funding arrangements within universities it remain to be fully worked out. It is unclear where the market will set OA publication charges: they are currently lower than the historical average cost of article publication; about 25% of authors are from developing countries;