Is Twins M1 worth it?

Is Railgun M2 worth it? If it is, should I buy it alone or should I buy it along with the "Tornado" kit(Railgun M2, Hornet M2, Spark)?

I have 11,000 crystals currently. Which one should I buy first? (I will eventually buy both.) 1. 18,600 crystals for Isida M1 2. 44,600 crystals for "Fighter" Kit (Twins M1, Hornet M1, Desert) Both are available at Sergeant-Major. I am just one rank from it currently.

Freeze, to me, is the superior Isida killer. I have been using Isida for a long time, and half of my deaths are from tanks with Freeze. I had favourited Freeze for a long time just behind Isida, but the thing I don't like about it is that it is short-ranged. I hope there is a long-range Freeze turret in the future. B) B)

I found Hammer tough to use and ineffective. Bought it just to get my "All M0 Turrets" achievement. I had regretted doing that.

I want Mammoth to get the "All M0 hulls" achievement, sadly if I want to buy it now I have to buy M1 directly - I rather buy Hornet

I found Twins M1 in the "Fighter" Kit - I think it might be good.

I love Hornet because of its balance between the speed of Wasp and the armor of Viking. Hornet is in between. Agility has been a priority among the ones who love to dash around, and that is me. I think Hornet works well with any turret, but the balance might not be as good when it is fitted with Shaft. I also like the fact that Hornet drifts. This way I can make tighter turns. In fact, I found it so agile that it had been a long time since I last widely used my Z and X tank turret controls.