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Whats the difference with RF enclosers and Others? I know the difference between vented and sealed but is there really a difference in the brands?

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No, the only determining factor with any enclosure is the measurement specs and what if anything they put in their enclosure to help make it sound louder than it is, as long as the enclosure is met to the sub or subs specs, its all the brand names.

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right make sure to get the box that compares with the sub specs for best performance. also build quality will be different when looking at diff brands (custom as well)

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The materials used, and how much of it can make a huge difference.

As the old adage goes "You get what you pay for."

Some companies use 1/2" to 5/8" thick pressboard. Pressboard is nothing more than a compound consisting of paper which is saturated with a mixture of water and adhesive. Then it's pressed by a huge hydraulic press which forces most of the water out and leaves then adhesive behind. It's then left to dry or "cure".

Other companies use particle board. A little better than pressboard, but is not very rigid unless used in very thick sheets. It also has a resonance which is very high.

The best material, which separates the good companies from the not-so-good companies is MDF (Medium Density Fiberboard). Normally it's used in sheets that are 3/4" to 1", but some companies occasionally use 5/8"

MDF is superior because it is very rigid and absorbs acoustics very well. It also has a very low resonance freq, which is great for subwoofers. It made nearly identically the same way pressboard is, but instead of paper, wood fiber strands are used. Instead of adhesives, a resin is used.

The ultimate in strength and rigidity would be hardboard. That's very heavy and very expensive, but if someone wanted to build their own enclosure and wanted it to last through a 3rd world war, hardboard would be a good choice.

BTW, resonance is the sound the wood itself generates. Take a hammer and tap each of the materials listed and you'll know what it means.