The following article, linked below, is considered essential reading for anyone new to electronic (paddle) keying as well as those who do not want to limit the possibility of operating at higher speeds (QRQ).
Learning to use a twin “iambic” paddle with electronic keyer is going to hamper your QRQ abilities, both now and later. If you are very sure that you don’t want to ever become faster at CW, and are already using twin paddles, you can carry on. The rest of us should use single lever.
Here is why and please be sure to read the entire article from start to finish to gain the maximum insight: