All residencies are trending towards the PMS-36 (3 year surgical... forefoot + rearfoot board elgibility) model. Some of the residencies which do not get enough RF trauma cases will remain PMS-24 (2 year surgical... only FF board elgibility). There used to be PPMR (primary podiatric medicine residency), RPR (rotating podiatric residency), POR (podiatric orthopaedics residency) and other 1 year models more focused on well-rounded - and typically non-surgical - basic podiatry, but those are being phased out.
While there are only two different "types" of residencies now, there are still vastly different programs. One PMS-36 might be markedly different from another. Some may be your inner city level 1 trauma centers or surgical hospitals where residents will be in the OR almost all day every day, and those residents might cover their required surgical volume 3-5x over and have very little time for primary or conservative care podiatry (nails, corns, calluses, etc). Other programs will have much lower, yet still adequate, surgical volume but be highly focused on academics, medically managing podiatry inpatients, and resident research/presentations. There are programs which are known for diabetes focus and wound care/plastics teaching. Also, there are still plenty of the "old school" residencies which offer exposure largely to toe and forefoot surgeries with a good volume of routine conservative care like nails, tinea/verruca, orthotics, padding, etc. While some of those "classical podiatry" residencies may less competitive or viewed as boring due to low surgical volume and trauma, they teach skills that will pay the bills and some of them actually tend put their graduates in great shape upon completion due to a lot of office exposure and reptitions with the "buisness side" and billing codes/paperwork of podiatry.
In the end, it all depends what you want to do. Some residencies will make you Mr. Trauma who can fix any ankle or foot fracture but has barely done any nail care or filled out an insurance billing form in the past 3 years. Some programs might get you published 5 or 10 times by graduation and have you set up well to obtain the fellowship of your choice or join a university faculty upon completion. There are ones where you will leave knowing the ins and outs of running a practice and ready to join a booming business or even start your own right out of residency. Ideally, you want a reasonable balance since podiatrists are viewed as comprehensive foot and ankle experts. The "best" residency for a particular person might depend on what they see themself doing, though...
The only problem with the residency models is that pretty much every pod wants to do surgery, and now we're all trained for it (well, some much better than others, but still...). It essentially ends up that, after graduation, most average practicing pods do 3-4 days of clinics per week and 1 or 2 days of surgery. I'd like it more if it was like dentistry where only the best grads got surgical residencies, so they did surgeries nearly every day in practice and perfected them. Likewise, other pods would become quite excellent at primary care, podopeds, sports podiatry, wound healing, etc and just refer out their surgeries to the best qualified colleagues... much like dentistry.