Zork looks interesting but I have no experience with it. I might have an issue with the corking rate mentioned. Last study I read had a smaller sample size but dividing the corked bottles in the number of bottles sampled I got 0.0053333333333333332.... or one-half of a single percent of the natural corked bottled wine in the survey ended up with proper 2,4,6-Tricloroanisole (TCA) spoilage. Not the 10% these guys are marketing to consumers.
When you look at who commissions the studies you see the natural cork industry studies are rather low on the corkage rate for natural cork and the synthetic corks show high corkage rates for natural corks. However, only one study, a natural corkage industry commissioned one seemed to follow proper scientific procedures of ISO peer reviewed protocol, alternative closure manufacturers' participation, life cycle analysis, etc.
Grade 1 natural corks of at least 4.5 cm length ( 1-3/4 inches) offer 20-year protection and should be a good choice if an only if you have long term storage needs. With natural you get what you pay for so they can get pricey at the higher end of the quality scale. Lower grades offer less protection and a cheaper price. When looking at cork grades you see lots of terms used, which is confusing, which is the whole point, an easily informed consumer can make easy informed decisions. Best to check with your LHBS/Wine shop if and only if you trust your shop proprietor to be well informed on corking options and quality. These days even regular grade agglomerate corks are now being passed off as winery grade corks. The shorter the cork the shorter the aging life, and the more you can end up with cork chips from a cork screw that goes all the way through a short cork
Given that oxygen plays only a minor role in the aging of wine, and with permeability being a consideration, that would knock both synthetics and natural cork out of the running. The screw cap resists oxidation longer than any other standard closure, so what you bottled is what is delivered when opened. Any delicate aromas are preserved in such an environment.
If you are bottling for very little time 1, 2, 3 years its really up to you what you use. Be happy with whichever decision you make.