The only advantage of the original kit would be if it made a repair which could then be cleaned out and plugged properly by a tyre company afterwards, I know some of the really expensive kits are sold on the promise that the tyre can be cleaned up and plugged afterwards whereas the usual tyre weld will get you home but most tyre companies wont attempt a repair on your tyre afterwards as the foam prevents a proper repair by a plug regardless of how much they try to clean it.
I must admit after struggling on a motorway hard shoulder in the pouring rain in the past with a puncture and a locking wheel nut which wouldnt budge whilst getting soaked and blown about by passing wagons I now carry a can of the cheap stuff in the boot of my everyday car and i'm prepared to trash a tyre by putting it in to get me home or to a safer place if necessary.
I'm concerned about people reviewing the stuff you are looking at and saying how long the repair lasts, any foam fepair is only an emergency measure and you need to get it sorted properly at a tyre company as soon as possible, here's an example of why -
I stuck tyreweld in my Merc to get me home one night, it did 100 miles down the motorway no problem and was still inflated on the driveway the next morning, but I drove the car down to the tyre dealer anyway and told them what had happened so they pulled the tyre off and found the puncture, I knew I would be buying a new tyre after using the foam but when the fella called me through to show me what had happened I realised how lucky i'd been.
The puncture had been initially caused by a 1.5in woodscrew about an inch from the inside edge of the tread, i'd looked around the tyre on the car when it went down but couldnt see anything due it being so far inboard, anyway the foam had sealed it but the tip of the screw had then spent 100 miles slowly chafing away at the inside of the tyre wall to a point that a half inch diameter portion of the tyre wall was now about as thick as a rubber glove, you could push your finger through it like elastic, another few miles and i'd have had a blow out.
So any foam repair is only to get you home or to a tyre dealer, you need to know what caused the puncture asap.
Totally agree - a salutary tale!
I was going to mention the temporary nature of such repairs but was in a hurry with my earlier post. You're right of course - a tyre full of gunge should no more be seen as a permanent solution than a spacesaver spare - I know of folks claiming to do only local mileage thinking it's OK to go on using the spacesaver for weeks after their puncture - just too tight to buy a new tyre - ridiculous - and dangerous!
Always get any DIY repair professionally checked asap - and be prepared to buy a new tyre.