Frame warranty swap options and resale value

Hello - I'm looking for some advice from those in the know as I'm a little out of the loop.
I found a crack on my 07 trek 9.8 top fuel and my excellent LBS have arranged a warranty deal with Trek but I don't know which option to take.
A) free swap of frame to hardtail 9.9 SSL, keeping my '07 Fox forks, 26" wheels and SRAM X0 groupset.
pay £550 for a new 9.7 fuel ex or superfly 29er (I could raise the funds but not easily).
Considering resale value in particular.... What would you do ????
Thanks.
I found a crack on my 07 trek 9.8 top fuel and my excellent LBS have arranged a warranty deal with Trek but I don't know which option to take.
A) free swap of frame to hardtail 9.9 SSL, keeping my '07 Fox forks, 26" wheels and SRAM X0 groupset.

Considering resale value in particular.... What would you do ????
Thanks.
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How much would someone realistically pay for a new 9.7 FS on eBay / pinkbike?
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