The best are the ones you punch yourself. There's no way you will get Bobas to go thru a prepunched carto, the holes are just too small. Buy a saddle valve from any hardware store and use that to punch your fave carto. They're under ten bucks. A really good punch is the one you can get from phiniac, the name escapes me right now, but I've had one for months and all I use is tanks so I punch cartos everyday, and the screw hasn't dulled even a bit. You can punch absolutely any size hole with it from huge to tiny and anything in between. Best of all it's under fifteen bucks.
2 cents from someone who uses carto tanks exclusively for many months.
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