Compare to the INT build, my STR/FTH experience was very different. For one thing, some bosses that were hard were now easy, and the ones that were easy were now hard. Field monsters melted, especially after I found Devonia's hammer; while slower than greatsword, this thing wiped the floor
However, for the first time in my experience with soulsborne games, I am giving up on finishing the expansion with a build. I just can't beat the final boss. My first build was an INT build, and I was able to beat this guy because I summoned and relied on co-op players to keep the boss focused on them. All I had to do was cheese the spells, but it was still difficult.
With STR/FTH build, I can't use anything holy-related because the final boss has resistance, my strongest attacks only chips away an increment of the HP, and I have to be near the boss's hitbox. It gets nearly impossible not to take huge hits during the second phase. There were many times where I thought I was out of its range, but still got hit regardless. I've challenged this boss 25 times with a co-op, and I have 4 more of those co-op items left.
It's also unmotivating me to try the dlc for a dex/arc build, which is all about bleeding the enemies. I heard dex and arc-related gears are littered everywhere in the DLC, but eh.... I am gonna get hit even harder with this final boss since the equipments won't offer high defense