Which mega should I use?

Question

Scizor or Alakazam?
Current team:
Noivern (special)
Infernape (physical)
Aerodactyl (physical)
Greninja (special)
Aegislash (physical)
Scizor/Alakazam

Bulk or pure offence?
Can anyone help me out?
Remember to give a detailed explanation along with pros and cons and do not suggest any other megas or change my team. Remember to also provide a moveset that's good for the Pokemon.
Take into consideration that I do not own Pokebank and I play X and Y.

Answer 1

You have 3 physical attackers and 2 special so I suggest M-Alakazam.

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M-Alakazam pros.

• HUGE special attack

• Godly speed

• Wide movepool

• Trace could copy something good.

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M-Alakazam cons

• Trace could copy a bad ability.

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M-Scizor pros.

• Can sweep unprepared teams.

• Good bulk and attack

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M-Scizor cons.

• Walled by defensive heatran, which is common.

• Not a massive movepool

• Any fire type moves will kill it.

• Has to rely on bullet punch.

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TL;DR, Go for M-Alakazam as it helps.Remember you don't always need a mega.

Answer 2

You have 2 special attacker and 3 physical attackers.
You don't have psychic-types and bug, however you have a Steel-type.

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Mega Alakazam

Pros:
Its SpA (175) and Speed (150) stats.
It includes powerful moves such as: Dazzling Gleam, Energy Ball and Focus Blast.
Trace ability can be good and bad. Depends on what ability it copies.

Cons:
Trace ability can be good and bad. Depends on what ability it copies.
It doesnt have dual type, meaning it only gets STAB from 1 type.

Alakazam @ Alakazite
Trait: Trace
Nature: Modest
EVs: 252 SpA / 252 Spe / 4 SpD
Shadow Ball
Psychic
Dazzling Gleam
Recover / Energy Ball

Mega Scizor

Pros:
Has access to priority Bullet punch.
Can sweep teams after using swords dance a couple of times.
Great defensive typing.
Technician Ability to power up bullet punch.
Learns roost for great recovery.

Cons:
It will be 2ko'ed by any good fire type move.
Slow and unable to do a no bullet punch sweep against opponents without spamming agility
can be stopped by an encore user or a steel resistor such as the fire types.

Scizor @Scizorite
Trait: Techinician
Nature: Adamant
EVs: 252 Atk / 252 Def / 4 HP
- Bullet Punch
- Swords Dance
- Bug Bite
- Aerial Ace / Brick Break

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Conclusion

You should pick one that can be very usefull in your team. Attack and Special Attackers can make the difference. Also Scizor having great moveset with priority + Swords Dance, makes him a killing machine. High defenses.
Mega Alakazam with very great Speed and Special Attacker, outspeeding everything, but the ability.. yeah.

I would go for Mega Scizor!

Swords Dance + Bullet Punch + STAB + Techinician + Priority + Great Attack Stat.

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Hope this helps.

Comments

Ok. Let's wait for more answers. Yours helps though c:

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Trace is NOT a useless ability.
Trace can copy Thick Fat, Protean and much more great abilities that can alter the issue of a fight with good predictions.
Dazzling Gleam Alakazam can become a temp fairy which avoids him many weaknesses when Protean is copied. This is one example, you've got so many others!

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Thanks! Still don't know tho :c

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I know, some maybe bad to. It's would be better M-Alakazam to have Magic Bounce? or Synch?