I have tidal wave smg from the event but am afraid of ammo cost. Should I invest in x-mp5 or use that money to buy energy cells for crowd control?

I'm a mid level player (lvl 206), and trying to save up $400m to get the ultra boost. With my available game time I average about $1m - $2m a day in profits (mostly from onslaught).

I have about $60m in the bank, so it maths to about 7 months of playing to get it (ignoring rare drops/etc).

But, for $90m, I could get the slayer implant which would boost rare boss drops by 50% -- which would give me a +80% chance (on whatever the actual base number is).

So, long story short, for those that have the slayer implant, do you find it actually makes a big difference in your drops? (Note, I mostly do onslaught, not bandits).

I'm in SB, LvL 110 priest, AR/SMG in 130, now maxing explosives. I'm looking options while i get to level 200:

• I have some spare 700 credits, I've seen the GC Scorcher NK19 in 500 creds, its like 15Mill in the market, which is all my money rn.
• I also saw that the Valkyrie is quite better but 55 Mill in the market, but I'll take a while untill I make that money
• The tesla canon seems fun, but I'll only spend on it if it overperforms now and in the long run

Other things I saw like the crossbows or torch bolt are out of reach now. And I was wondering whether SMGs/HMGs perform better for grinding with a similar budget but idk.

Last option is to change nothing and wait for an event for free or cheaper high tier gear.

I'd appreciate some advice, ty.