alot of investors will say - wholesaling will be the quickest and "easiest". easy because you're not sitting on land, you're not busting your butt or contractors butt to finish a rehab, etc.
you're purchasing with assignment rights and you're buying at a signficant discount so that if you cannot wholesale to investor (a possibility, but more than likely, if you've done your networking homework, not going to happen) - you'll be purchasing a property signficantly under market value (over 30%).
with foreclosures - that's different. banks won't really get involved with people buying with assignment rights. they don't want to get mixed up in that. foreclosures - actual homes that have been through the entire process and are bank owned are not really deals. banks look to get fair market and most (i'd say) sell within 10 to 15% of market value (depending on where you live)...and at 10 to 15% of "market value" - who's determining that? a bank or the actual market - buyers.
anyhoot. good luck!