There is a lot of confusion about Interior doors, the construction and how it impacts design details. It is important to go over the details that will be important to you as this will impact price, availability etc.
Molded Panel - This door can come in Hollow or Solid options, and can be mixed and matched as the outer design stays the same. Usually has more size options and will be the most cost effective choice (Hollow Core) if one is budget conscious. It mimics the look and style of a True shaker door, while offering affordability of a hollow type door. You can see this door will come with a beveled profile.
Solid MDF Shaker - This door is constructed of solid materials with true stiles and rails built around a solid panel. This construction offers us durability along with the weight and feel of a high end door. This door type of door will always remain a classic. You can see this door will come with a square (90deg) profile.
See shaker options here