The T5 will put on a better light show.
Anyhow, don't let the stove vendor pressure you into an installation different than what you want. There's no compelling reason for the vendor to do anything more than deliver the stove. What if your house already had a perfectly good chimney liner from a previous stove? Would you be worried that the vendor would not give you after-sale support on the stove if you didn't also buy a new chimney from them?
Anyhow, don't let the stove vendor pressure you into an installation different than what you want. There's no compelling reason for the vendor to do anything more than deliver the stove. What if your house already had a perfectly good chimney liner from a previous stove? Would you be worried that the vendor would not give you after-sale support on the stove if you didn't also buy a new chimney from them?
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It really is a separate issue from the stove transaction. If you decide to shelve the project, you will probably find a better deal on the stove in the spring.