Is a SCRAM jet more efficient or is a RAM jet more efficient?

Im trying to design a Vertical Take Off and Landing stealth fighter with a one winged design. Ive got the frame of the aircraft drawn out but Im wonde

I'm trying to design a Vertical Take Off and Landing stealth fighter with a one winged design. I've got the frame of the aircraft drawn out but I'm wondering which propulsion system would be more efficient for speed and long distance flights. A RAM jet engine or a SCRAM jet engine?

or:I'm trying to design a Vertical Take Off and Landing stealth fighter with a one winged design. I've got the frame of the aircraft drawn out but I'm wondering which propulsion system would be more efficient for speed and long distance flights. A RAM jet engine or a SCRAM jet engine?

or:ramjet

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