So I often come across topics that involve fights between Brandon's magic users and one of the most often talking points is how overpowered Mistborn are. I however have a hard time seeing that especially from the perspective that Stormlight Archive has given me. So I'm going to give a run down on how the two compare, and later an all out comparison from all magic systems.
1. Attack
Radiant- Shardblade, enhanced with Plate (Division, Gravitation, Transformation buffs when applicable)
Mistborn-Pewter, Steel, Dur-aluminum
In the offensive category the Radiant takes a huge advantage over their Mistborn counterparts, as most if not all of their attacks are one shot kills, on any non-Radiant, while A Mistborn's best is deadly it just isn't on the same level, Dur-aluminum can get it there but that make it a one time use.
2. Defence
Radiant- Shardplate, Shardblade, (Illusion, Tension buffs, when applicable)
Mistborn- Pewter, Steel
While a Radiant can shrug off basically anything a Mistborn is basically a glass cannon, and can only take so much punishment
3. Healing
Radiant- Stormlight, (Progression buffs, when applicable)
Mistborn- Pewter
While A Radiant can basically live through anything as long as they have stormlight, a Mistborn only has a boosted recovery and no regeneration.
4. Sensory
Radiant- Spren, Stormlight, (Potential Tension/Cohesion buff when applicable)
Mistborn- Tin, Bendalloy, Bronze
Mistborn Actually wins this one being able to get more think time, and greater sensory input as well as an investiture detection.
All in all While a good build Mistborn just simply aren't up to the level of punishment a Radiant can dish out, and can't do enough damage of their own to be an effective match up.
Now I will look at all of the Major investiture users in the Cosmere, this will only count users of ONE magic system. Additionally fabrials and medallions will not be counted.(This is assuming all builds are at their peak that could reasonably be achieved (Radiant with Stormlight, Mistborn with Metals, Feruchemist with stores etc)
Radiant has the highest base damage defence and Healing
Feruchemist a useful power but with diminishing returns not the most impressive of magic.
Hemalurgists can basically become Fullborn, but at the cost of a huge vulnerability, that being that Allomancers and Harmony could seize control of them. I find this flaw too big for this magic system to be of real consideration.
Allomancers, relatively balanced but with almost no heal options and only two decent forms of attack.
Elantrian, Powerful and well rounded, the only drawback is that the power is regionalized and thus not a big power.
Voidbinder- ???
SandMaster, Has a high powered attack but lacks the healing and defence needed to really compete with the big players.
Awakener, almost useless in battle they could prepare something nasty but in a one to one battle, almost useless
Dakhor, Alright not really noteworthy in any regard, also regionalized.