It is not the labeller, it is the tape that is crucial. paper, plastic, or 'metal'. Some fade faster than others. If it is just for pots and seedtrays and is short term, the paper is alright. But outside they suggest 'metal' which is the coating on the tape. The tape is expensive but you can pick up some bargains on the internet.
If you can find the old fashioned embossed kit, it is the best. The modern dymos print the name.