I think the upped one is weaker.
only for one turn?
Yes, but whole damage from fire is absorbed, so if enemy has a firewall, upped Salamander will get +1 attack every turn. Also there are not a lot of ways to kill upped salamander for fire. Then if you have too much fire quantafor example 75, you may attack your salamander and it will get +24(or 21... I don't use fire, so I don't know) attack for one turn, when unupped salamander will probably die.
Y U No just bolt your enemy?
These are all the fire damages. (Immo do not count since it is sacrifice not damage)
Not so many, don't you think so?
When using unupped Salamander, I'd Rage Pot it.
When using upped Salamander, hmm, well, do'h, Rage Pot works but no better than any other creatures.
If I want to Rage Pot Salamander, it's better to using unupped one.
Because probably opponent may have a shield blocking spell damage?
Yes, there are not many fire damage cards. The best use for salamander is adding it to earth/fire deck:
I actualy was not thinking about this deck enough. I also have no experience in making fire/earth decks.
Pillars for quantum
Plate armor and Basilisk blood is for making salamanders more powerful(if you played enough salamanders cards, using Basilisk blood is safe enough)
Gnome riders for quantum and small attack at start of battle
Enchant artefact for protecting fire shield
Salamanders are main in the deck
Fire bolt for removing opponent's creatures, killing opponent or feeding salamander
Fire shield for removing opponen'ts creatures
Lava Golem is secondary damage(if you have not enough earth pillars/quantum)
Red nymph for feeding Salamander or killing opponent's creatures