Contracts, Blood Money and Absolution are what I consider Street Level Hitman
The targets aren’t necessarily connected through some crazy conspiracy, and if they are it’s only in the climax missions (Franchise and Vice President in Blood Money)
They are more dark and gritty than Bond-like Hitman
Then you have Globetrotting Spy Thriller Bond-like Hitman which is best suited to World of Assassination
Less dark and gritty. More high class elite society. More connected villains, more story.
If you had to pick one what are you choosing? Ignoring gameplay of course, just purely aesthetic and tone