What type of DES should you opt for if a patient has or is concerned about possible nickel allergy?

For a coronary stent, I would lean toward a Medtronic DES. There are published recommendations for nitinol with a durable polymer. That said, I cannot remember more than one case in 25 years where I thought that a metal allergy may have played a role in a patient receiving a stent and that was prior to the DES days. Mayo published a report in 2012 (Romero-Brufau et al., PMID 22456027) suggesting that stents are generally safe in patients with nickel allergy. Serious reactions seem to be in the case report form only despite a fairly high prevalence of reported nickel allergies in the population. 

My understanding was that the typical nickel allergy was cutaneous, so it hadn't impacted my choice of stent.