I suspect that modern class 10 are actually fairly good at random access now as well though.
Possibly those marketed as "Ideal for Android ..."? (I have a couple, one's in a tablet, the other was briefly used for a test of NOOBS 1.3.9** but not "run in anger"
** Item 'Q' here: http://www.cpmspectrepi.webspace.virgin ... cards.html
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, B2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, A+ and a B2) but Buster on the P4B's. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm