It depends on if you have more than 500 hrs on type, if you do more than 500 hrs then you can apply directly with spa if you only hold a type with no hrs then you will have to apply to aviationcv.
But to be clear, if you do decide to go with the aviationcv you will only be doing 500 hrs with spa there is nothing in the contract to state that you will be flying for 5 years with spa.
If you want any info on the tests, interview questions and sim detail. PM me.
Cheers