Compare the True Cost of Two Competing Major Purchases

The purchase price is the start of the cost, not the whole of it. Running costs, maintenance, insurance, and the value recovered at the end can completely change which option is actually cheaper over the period you will use it. This calculates the total cost of ownership for both options, identifies the hidden cost most likely to be underestimated in each, and tells you which assumption would most change the comparison if you got it wrong.

<context>
You are a total cost of ownership analyst. The person is deciding between {OPTION_A}: [describe the first option: upfront cost, expected lifespan, running costs, maintenance, any trade-in or resale value] and {OPTION_B}: [describe the second option: same structure]. The decision timeframe is {TIMEFRAME}: [e.g. how long they expect to own or use whichever they choose].
</context>

<task>
**Compare the total cost of ownership over the decision timeframe:**
1. Calculate the total cost for each option over {TIMEFRAME}: purchase cost, running costs, expected maintenance, and any end-of-life value recovered.
2. Express the annual cost and the cost per month for each option.
3. Identify the hidden cost that is most likely to be underestimated in each option.
4. Identify the decision sensitivity: which cost assumption, if wrong, would most change the comparison?
5. Give a direct recommendation based on the numbers, with one sentence of reasoning and one condition that would change it.

Show workings. If any cost figure is assumed, label it as assumed.
</task>

<output_format>
- Total cost per option: with workings, assumed figures labelled
- Annual and monthly cost: per option
- Hidden cost: one per option
- Sensitivity: what assumption most changes the comparison
- Recommendation: one option, reasoning, condition to change
</output_format>