Its slightly lagged in a way behind GLA for long haul because of the shorter run way and the fact likes of Orlando, Vegas and the Caribbean are popular with Glasgow holiday makers.
GLA only has more bucket and spade long haul, EDI has considerably more daily long haul departures from United, American and Delta.
It has always been strong to the European cities
That's sooo not the case. EDI was way behind GLA for many years, Scottish Airports had great plans for GLA to become Scotland's main airport and the marketing and investment was spent to support that. In the early 90s EDI had Air France to CDG and Air UK to AMS with Aer Lingus flying SD360s to DUB whereas GLA had B737s and BAC111s. GLA had SAS as well as Lufthansa at the time.
Times changed and what GLA did to PIK, EDI is now doing to GLA (sort of). The key driver has been an enormous leap in inbound tourism coupled with the rise of Edinburgh's role in government and Holyrood raising the profile internationally. Remember when Air Canada came back to Scotland, they chose EDI over GLA, United have three daily out of EDI and one out of GLA, something my younger self would not have believed.
The main thing is both are now seeing healthy growth. IMHO EDI risks doing an LCY. Really hacking off frequent fliers by not having the facilities to support a hugely increased throughput. Time will tell.