Vacuum Pros:
Many feel it’s more comfortable, especially early on. Allows you to stick your toe in the water, feel out hanging. Some can hang for longer times than with compression hanging. Can be started for a few dollars if you look around online and/or make your own.

Vacuum Cons:
Need for taping and untaping the glans to prevent blisters, or every time you need to pee. The more weight used, the higher the vacuum inside the “cup” of the hanger is. Most vacuum hangers have no gauge and therefore, no way to SEE how much vacuum is inside the cup in relation to the weight. Every blister requires you to stop hanging and take time off to heal. Usually 2 weeks or so. This slows progress.

Compression Hanging Pros:
Similar, easy entry. Shop around, low priced options can be found. Similar to vacuum, you always know exact resistance used via weight plates. No need to worry about vacuum induced blisters. Need to use wrap to fit hanger to penis, but wrap doesn’t prevent urination or need to come off between sets, or to pee.

Compression Cons:
Sets should be limited to 15 to 20 minutes due to restriction of blood flow. However, long term, not much of a con due to the fact you can continue adding weight as the tissues adapt with no concern for blisters and quality of stretch is more important than time under stretch. Need to learn to wrap. Slight learning curve but fairly simple with guidance as needed.