You probably don't have to worry too much about sharpest and finest grained part, especially for your 4x5.(posted 8344 days ago)Except for Tech Pan, TMX (T-MAX 100) is probably the one of finest grained film. Delta 100 is also good, and it's often said to be sharper.
For landscapes, you might consider another factor - reciprocity failure. TMX is the best film to use with a few minutes exposure.
I like nightscapes exposed on TMX, processed in Ilford Microphen 1+1 and printed on Agfa MCP.