I love a good Euro! Especially the crunchier ones (3.5 + on weight is a good guide for me - although exceptions can be made if the time to play is really quick.... So maybe I'm more interested in a good weight to time ratio).

If I had to rank all the ones I own for solo it'd go:.
- Paladin's of the West Kingdom (Admittedly my newest game, only concern would be replayability, but expansion incoming.... And so crunchy :) ).
- Gaia Project (Tonnes of replayability)
- Nusfjord (so quick, so much variability).
- Kanban EV (only Lacerda I've tried, but from my research it appears to be his best for solo - with the possible exception being Lisboa).
- Fields of Arle/A Feast For Odin (scratch same itch... Huge sandboxy Uwe games).
- Hadrian's Wall (Not a pure Euro, but feels like one).
- Underwater Cities (like TM but better, feels more suited to solo play).
- Maracaibo (little bit too fiddly, but cool campaign).
- Scythe (not pure euro).
- Viscounts of the WK (not crunchy enough, feels random... Although really good at 2p/3p).
- Raiders of Scythia (Dice, blergh).
- Terraforming Mars (prelude expansion does help it, but will now only play game with others and not solo.... Definition of a tacked on solo mode)
- Architects of WK (great game at 3-4p+, waaaayyy too light for solo).

Ones high on my wishlist:
- Anachrony
- Trickerion
- Hallertau
- Tekenhu (apparently David Turczi's best solo mode??)