Starter TT bike Cannondale 105 slice vs Boardman ATT 9.0

Hello, just wondering which to go for. I was set on the Boardman until I seen this deal on the Slice which has a lot of extras.
I can get the Boardman with the code and cycle to work costing £1024
https://www.cyclerepublic.com/boardman-att-9-0-mens-time-trial-bike-2019.html?gclid=CjwKCAiAqqTuBRBAEiwA7B66hS5AaoLtTcMLian3vLAwNbLbYxwYcJ5vrZEqJVlpTBiuJUkZERpBHBoCpa4QAvD_BwE
Or I have found this Triathlon package here coming in at £1050 with a discount code
https://www.triuk.com/Triathlon-Bikes/Cannondale/International-Only---Cannondale-Slice-105-Replica-Mens-Triathlon-Package-Black-or-Lime/360553
I can get the Boardman with the code and cycle to work costing £1024
https://www.cyclerepublic.com/boardman-att-9-0-mens-time-trial-bike-2019.html?gclid=CjwKCAiAqqTuBRBAEiwA7B66hS5AaoLtTcMLian3vLAwNbLbYxwYcJ5vrZEqJVlpTBiuJUkZERpBHBoCpa4QAvD_BwE
Or I have found this Triathlon package here coming in at £1050 with a discount code
https://www.triuk.com/Triathlon-Bikes/Cannondale/International-Only---Cannondale-Slice-105-Replica-Mens-Triathlon-Package-Black-or-Lime/360553
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For me that would be the Boardman.
Edit: Just had a look at the geometry and the stack on the Slice is a lot higher (27mm higher for the Slice 54 vs Boardman SM) So it depends on whether you are long and low or tall and thin.
I've got long legs for my height so I go tall and thin. Pick which one suits you best. Note that this doesn't mean I'm tall or thin, it just means it's a better fit for my body shape.
Race - Fuji Norcom Straight
Sun - Cervelo R3
Winter / Commute - Dolan ADX
I'm 5'9" but I've got a 34" inside leg. This means my saddle height is 775mm on my TT bike. If I pick a bike that's too low at the front I'm either going to have to put a load of spacers under the stem or my hip angle is going to be very closed and my lower back is going to hurt like hell. Neither of these things help you go very fast regardless of how aero you look.
So, for my shape I need something with a relatively high stack. In my case a Fuji Norcom Straight, and even then I've got 25mm under the pads to bring them up a bit.
Race - Fuji Norcom Straight
Sun - Cervelo R3
Winter / Commute - Dolan ADX
If you've done some before ignore the above.
If the bug bites then look at getting a s/h bike locally later in the year or for next year. There are always a surprising number of people who buy a TT bike, ride it for a season or even less then losing interest or other commitments mean they don't race any more.