I love the hydrangeas because they're so bright! I also really like white azaleas because I think they go really well with pink themed towns, and I like the leaf shape of the hollies.
I like all of them except for the hibiscus bushes because I feel like those are a more "island" town and I can't incorporate them into my town without it looking out of place.
I like the blue hydrangea bushes the best! Blue is my favourite colour, so I love all the blue plants in the game. It's a shame the hydrangeas don't last longer, though.