I also don’t like it if a tool only stores my financial data in the cloud and doesn’t let me export it.
The other two Android apps you mentioned are no longer available (OneTouch Expenser) or abandoned for 3+ years (Expense Manager).
For such long-term and sensitive tracking, I rarely trust any tools other than general-purpose spreadsheets, that are going to both be maintained in 10 years, AND allow you to export data.