I have an OSCP and I’ve looked at eCPPT. At a student level, I would recommend eCPPT. Elearn has some great material, that’s really well explained and is more geared towards learning with just enough practice to drive the points and learning home. The material is pretty well guided and solutions are available if you get stuck, in addition to their support. They have labs so you practice as you learn but they aren’t very deep. Following up with a exam where you have hack enough of their labs to pass and write a passable report. I think their material is great and you’ll learn a lot. They are not as well known as OSCP which won’t have the same resume appeal. However, good hiring managers will look up certs they don’t know and realize the value of the cert.
OSCP is geared towards people who have developed pentesting skills and want a challenge that’s more than open source challenges. Their materials are great but not complete. The learning material they provide will not be enough alone to allow you to pass the exam. Solutions are not available if you get stuck. They have support but they aren’t there to help you with the basics. Unlike elearn they don’t hold your hand; you’re on your own. They generally help with more advanced issues. When you’re able to get 90% to taking over the box but need help with the last 10% they will generally help. If you need help getting started they’re probably going to tell you to try harder. OSCP has networks worth of labs for you to mess around in, it’s awesome and deep. That’s the real appeal here, you learn by doing. The materials walk you through the basics and then they tell you to go do it. Exam is similar but I assume harder, than elearn’s exam. You’ll need more time to get through the course. As you get deeper into the network the computers are better defended. Getting through everything is a pleasurable torment.
I would recommend OSCP after you know what you’re doing and you want a challenge that’s more then what can be found in the various vulnerable open source distros. I learned a lot with the OSCP but I wouldn’t recommend it for someone getting started.