TCA and Jessner Peel for Better Results?

A TCA and Jessner's combination chemical peel, originally described by Monheit, is definitely stronger than a TCA peel alone. In fact, it's an order of magnitude higher, going down to the dermal layer of the skin rather than just the epidermis. It also requires such things as prophylactic antiviral medications to protect you against herpes simplex (cold sore) outbreaks over the face. This combination is considered a medium depth peel, and has much more downtime than a TCA light chemical peel. Expect peeling for 4-5 days and redness for 2 weeks, but good results with regard to sun damage, texture, and pigmentation. Being a more invasive procedure, it's also more expensive.
How good your results will be depends on what you're using it for... this is the key question. Are you trying to improve photodamage and skin texture? Then it's a great peel. Are you trying to improve fine lines and wrinkles? This peel will get you closer than TCA alone, but other modalities or a stronger strength TCA (but don't go higher than 35%) may be necessary.

A good option to get more results, without using a stronger acid is to layer more than one acid. This is a published procedure and is a common practice among dermatologists.