Answer: In my experience, shrubs tend to be fairly short lived in above ground containers in cold winter climates such as yours, so root space may not really become an issue. The roots are not as well insulated in a container as they would be when planted in the ground. This causes stress, not only during extra cold periods but also during times when there are freeze/thaw cycles. So even though considered winter hardy when planted in the ground, the shrubs may not survive the winters in the container. Of the two, the Canadale Gold is considered the more winter hardy or cold tolerant, so that would probably be the better choice. I might also mention that in your area, the Euonymus fortunei is not going to be fully evergreen. It may hold some of its foliage through the winter in some years but will more likely be deciduous; I don't know if that is a consideration or not. I wish I could be more encouraging.
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