Check for spark on both plugs, if only getting spark on one of them try pulling the kill wire off both coils and check for spark again. If you have spark on both with kill wires removed, you probably have a bad kill wire with bad diodes. You can pick up a new kill wire with diodes on Amazon...
Everybody is different on their preference. You can spend a ton and get an oem from Deere or go-to Amazon and grab a cheap one that will probably work just as good for minimal cost