Lees' modern reloading is one of the best starter manuals, the load data given there is very generic, therefore safe data you can't go wrong with this book. You can use it to work up loads in powder and bullet configurations not found in other manuals. Their data on usefull case capacity is a plus.
The data found in the powder manufactuer manuals, are published to enhance the specific powder being hawked by said manufactuer, same goes for the bullet manufactuer load data.
The stand outs being Lyman and Lee, they are both reloading equipment makers and have little to gain by touting a specific powder or bullet combos.
Nosler and Hodgdon seem, to be the books in my opinion that give the greatest knowledge. Nosler in their load density percentages, and acurracy toutings, and Hodgdons,willingness to publish other powder manufactuers data along with their own ( although this is just a advertisement scheme to make their own powder stand out as better price per grain, along with lower pressures).
There is no ONE best or correct load manual. Buy or read as many as possible, your reloading data library should have as much data as possible.!