It all comes down to a matter of opinion, but here is my choice for the "best" hymnal of old time gospel songs.
Heavenly Highway Hymns
(with shape notes)
Compiled by Luther G. Presley
Stamps-Baxter Music and Printing Company
A Division of Benson Music Group
You should be able to find it in any good Bible bookstore, if not, they can order it for you. Here are just a few of the 324 songs~~ After The Sunrise, Anchored In Love Divine, Are You Washed In The Blood, Come and Dine, Drifting Too Far From The Shore, Higher Ground, I Shall Not Be Moved, I'll Be List'ning, Kneel At The Cross, Mansion Over The Hilltop, On Jordan's Stormy Banks, Precious Memories, Rock Of Ages, Saved By Grace, The Old Gospel Ship, The Unclouded Day, There Is A Fountain, Victory In Jesus, Where The Roses Never Fade, Will There Be Any Stars.