Fallout London has the best 3d worldspace in any Fallout game.

The effort put into London's mix of real world architecture, blending with Fallout's architecture and then made playable in a post apocalypse setting is chef's kiss. London is a fan project that has the best map in a Creation Engine game. NV might have a clearer design, but visuals, detail and atmosphere are fantastic in London.

They made a dense urban jungle filled with historical and sci fi ruins. Boston is a town in comparison that has a lot of uninteresting forrested areas. Starfield is just so uttlerly empty and void of interesting design or scope.

London feels its true size despite being compacted into a game space. So many iconic landmarks, ruined towers, shattered urban streets, pre ww2 architecture, post ww2 and fictional retrofuturism...and when not in the city you get nightmarish rad storm swept industrial centers in the northeast, fracking and fallout turning the south into Mordor. And crazy rad roided shroom swamps in the south east.

I would recommend London to any Fallout fan based on how stunning the open world map for a free mod for an old game.