I have a couple of simple question (I hope) that I'm sure all of you professionals can help me with. I have a JD LX188 riding mower and I need to replace the blades. My first question is: What is the difference between regular, medium, and high lift blades? I do not bag and am not currently set up to mulch. My second question is: Are aftermarket blades worth the money savings or are OEM blades the only way to go. Thanks in advance for any insights you can give me!!!!!