Which area for calf implant do you recommend? Subfascial or under the muscle?

I have been performing calf implants in the subfascial plane for over 18 years and I am yet to hear of any reputable and experienced calf implant surgeon successfully place these implants submuscular without any major complication. There simply is not a good tissue plan to put these implants under or even within the muscle. I would make sure to get more details from the surgeon and how many he has performed this way and what the before and after results look like. 

Definitely under the fascia. 
However, some people say "under the muscle" when they actually mean "under the fascia of the muscle". 
There is almost no benefit from putting them under the actual muscle, which causes too much trauma and complications. 

I place my calf implants between fascia and muscles - this is much safer position that under the gastrocnemius muscles. Requires much less dissection (trauma) and much less chance of complications. Visibility is usually not a problem if one uses soft silicone implants

HiI perform calf implants in the subfascisl plane. That is the commonly accepted plane for both calf and arm implants. I’m not sure how one would place calf implants intramuscular or sub muscular without a large visible scar and I have not heard of that plane being used for this procedure. I would ask for more clarification and photos of before and afters if your interested in moving forward with the surgeon you met with.Best

The safest and most effective pocket for calf implants is subfascial. While calf implants can be placed under the muscle there are nerve injury risks that are associated with this approach which is why it is almost never done. The subfascial plane is very effective and safe, and like all implant related surgeries, the result is based on the shape and size of the implant. Calf implant 'show'; is a function of too superficial placement (above the fascia) or implants that are oversized and have edges that are too round.