Breaker is a a Light weapon, with Speed 11, that deals 6-9, +4 Spirit with Holy II and 6% Crit. Longsword is a 1-H weapon, with Speed 10, that deals 6-11, +6 Spirit with Holy II and 6% Crit. So for your exact question, Paladin Longsword vs Spirit Breaker: Pretty much sums up the entire discussion on weapons, armor etc.

If you run past the Baleful Shadow and down the elevator to activate the Lake of Rot Shoreside Site of Grace, this will provide a faster and safer boss run.First, here's the equipment section of the Wiki.

However, the Baleful Shadow's sword is imbued with Destined Death, not the Frost enchantment that Blaidd's sword is enchanted with.

Resembles Blaidd the Half-Wolf, sharing even the same moveset.You will need to inflict poison damage six times to kill him, and each subsequent time you inflict takes more casts of Poison Mist, so bring some Flask of Cerulean Tears. You can sneak up to this coffin and cast Poison Mist to inflict poison damage.By keeping the middle one between you and him, he will be mostly unable to cross it, and you can hit him safely with a ranged weapon. The Baleful Shadow first spawns in next to 2 coffins.Takes two parries to break stance, the first parry is followed by unparryable horizontal slash with very long wind-up and high poise damage.In this case you can roll forward to his left side for a backstab opportunity. When you're close he can use a spinning attack instead of jump attack, both of which begin in the same stance. You can easily get a backstab opportunity if you roll forward, aiming slightly to his right side, during his jump attack, frontal charge attack and grab attack.It will take three or four full hits with Hoarfrost to apply the Frostbite status, dealing a chunk of health damage but more importantly slowing it down significantly, allowing you to dodge his strikes and easily circle around for backstabs, as its turn rate will be significantly reduced. The Ash of War Hoarfrost Stomp can make this fight significantly easier, as it will often catch the Baleful Shadow despite its attempts to dodge projectile attacks of any sort.

Can be poise-broken, riposted and parried.Note that these go down over time, and increase each time the effect procs. For example, if a resistance is 100 you must deal 100 points of whatever aux buildup to trigger it. The resistance numbers are the buildup amount to trigger it.

Best weapon in shadow fight 2