They are unique and personal - no one else needs to touch them or use them, so who cares how they are made
I have made Runes out of wood, shell, stones and fimo - but Istill go back to using my Jasper one's.
As for better than Tarot - I love theTarot, but personally I find Runes more accurate and they seem to read better for me.
A bit of fun with your Runes (and a means of 'testing' them) - grab some paper and write down 100 questions. Take some time if you like, just jot them down as you think of them. You can split them into categories if you like (ie" play, work, love and home) and feel free to ask the same question more than once but make sure the question is re-phrased.
Using the Runes as 'yes', 'no' and 'un-sure' - ask the Rune your questions from 1 - 100 and write the answer beside the question. Look back on them and see if there are any contridictions. Every time I have done this, they have always been spot on.