The GPL Font Exception is specifically designed for fonts, using this license will making your fonts freely under this license if anyone use your fonts under his/her purpose under GPL license.
This license can be used along with OFL, you can see what Aleksendr Andreev does anyway here.
I believe the OFL would be much better than GPL, because the OFL is written specifically for the nature of fonts, and there is now a huge commons of OFL work that is not compatible with any other license.
The GPL Font Exception is specifically designed for fonts, using this license will making your fonts freely under this license if anyone use your fonts under his/her purpose under GPL license. This license can be used along with OFL, you can see what Aleksendr Andreev does anyway here.