In all honesty, Royal Saudi Air Force is miles ahead of The Turkish Air Force in capability. Turkey produces quality pilots but I am not sure if this factor would be sufficient to offset the advantages of Saudi F-15 fleet in combat operations; maybe not.
Conversely, situation is opposite on the ground; Turkey fields a much larger army than Saudi Arabia. Even though Saudi have good equipment, Turkish armed forces might overwhelm them in conventional engagements on the ground.
Another factor is Saudi territory; Saudi Arabia is a huge country to occupy and Turkish armed forces risk the prospects of spreading thin if they want to consolidate their gains on the ground. However, Royal Saudi Air Force can capitalize on this situation and hit them hard. Therefore, an occupation may not be feasible for Turkish armed forces.
Holistically, Turkey seems to be better prepared for war but Saudi are not to be underestimated because they are spending a lot on defense-related matters in current times.