I Mac 21.5" or I mac 27"?

I am currently looking at buying a new computer.
I am after an I mac, as I have a I pad for portable browsing.
Undecided whether to get the I mac 21.5" or the 27".
I currently have a laptop with an additional screen for when I am word processing, and copy typing.
The computer will mainly be used for my business,mainly research, quotation and invoicing, emailing etc.

Can anyone give me advice as I am a mac beginner.

Many thanks

Mac

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