Ok so, going with the 75 point version as its neater

Land Raider Redeemer
Armoured Vehicle; Save 4+; Speed 25cm; CC5+; FF3+
Frag Launchers; (base contact); Assault Weapons
Twin assault cannon; 30cm; AT4+/AP4+
2 x Flamestorm cannon; Range 15cm; AP3+; Ignore Cover
Notes: Reinforced Armour, Thick Rear Armour, Transport (1 Terminator or 2 other)
Land Raider
Armoured Vehicle; Save 4+; Speed 25cm; CC6+; FF5+
2 x Twin Las Cannon; 45cm; AP4+; -
Twin Heavy Bolter; 30cm; AP4+
Notes: Reinforced Armour, Thick Rear Armour, Transport (1 Terminator or 2 other)
So the differences are
Land Raider Redeemer
CC5+; FF3+
Frag Launchers; (base contact); Assault Weapons
Twin assault cannon; 30cm; AT4+/AP4+
2 x Flamestorm cannon; Range 15cm; AP3+; Ignore Cover
Land Raider
CC6+; FF5+
2 x Twin Las Cannon; 45cm; AP4+; -
Twin Heavy Bolter; 30cm; AP4+
Its basically comparing attackability, if thats a word.
The CC is very minor. I'm not to fussed when I have one or maybe 2 in a formation that when I get jumped I hit back on a 5 not a 6. Yes its a boost, but its a minor one.
So it comes down to the attack profile. Obviously AT/IC pros and cons feature.
Double (outside 30), double, support (unlikely unless the target runs away)
Land Raider
8/6AT 2/6AP 2/6FF
Red
2/6AT 6/6APIC 4/6FF
Double (outside 30), advance, support
Land Raider
10/6AT 3/6AP 2/6FF
Red
3/6AT 8/6APIC 4/6FFIC
Double (inside 30), advance, support
Land Raider
10/6AT 5/6AP 2/6FF
Red
5/6AT 8/6APIC 4/6FFIC
Double (inside 30), engage
Land Raider
4/6AT 2/6AP 2/6FF
Red
2/6APAT 4/6FFIC
Double (inside 30), sustain
Land Raider
12/6AT 6/6AP
Red
6/6APAT
I guessed based on that they would be on par and come down to role, so perhaps I would expect normal raiders with devs and redeemers with tacs assuming an aggressive profile?