My opinion, FWIW:
Balls out: H22A, no doubt. It's gonna be hard to run more than about 8 psi, though, because in a 94 Civic, traction is gonna be the biggest problem. Also, be ready to go without A/C and power steering.
Streetable power: B18A/B. More displacement. 1854cc compared to 1797cc of the B18C. The B18C does have stronger internals, but it's to handle the high redline. VTEC is kinda (but not completely) ineffective under boost, and you'll benefit more, IMO, from the displacement of the B18A/B than you will from the redline and VTEC of the B18C. Besides, you'll save enough on the engine to go get some forged rods and pistons.
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