A Private Key is also created at the same time when you create the Certificate Signing Request (CSR) and must be kept safe as it is required for your SSL Certificate to function correctly.
Some technical jargon for those who relish it.
Simple answer choose the 2048 bit key size
Creating a Certificate Signing Request (CSR) with 4096 KeySize definitely increases the encryption strength of your SSL certificate. However, the web server experiences a higher overhead.
Note: If you are an AWS user should also keep in mind that the Amazon CloudFront only supports 2048-bit keys. Cisco IOS XE before Release 2.4 and Cisco IOS Release 15.1(1)T also do not support 4096 bit keys.
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