Top three calculators ?

[tuxfish]

Hardware:
1. HP-32E (my favourite Spice)
2. HP-12c (I collect Voyagers & am in search of the 5 Brazilian HP-12c Prestige)
3. HP-41C, HP-15c

Software:
1. HP-15c simulator of Torsten Manz
2. WP-34s
3. HP-32E emulator of Panamatik (HP-01 and other Woodstock/Classic
emulators of his are nifty as well)
4. New kid on the block since Allschwil'18: Virtual HP-41 Release 9 (HP-IL built-in!)

BTW: All of these calculators in software work excellently "out of the box"
under Wine (Linux or Intel MacOS).

When it comes to important figures, I trust the calculators more
than a spreadsheet ...

As a rule of thumb: every calculator comes in three:
1x work, 1x home & 1x as reserve
(“...still echoing in his brain: The Ramans do everything in threes.”)