5.2.6 or boss rush?

I was currently hoarding some units for 5.2.6 but then I remembered the boss rush. I'm ok at the game but it really gave me some trouble. I ended up using 200 units on the first day but I really need the rank up resources and the 5-star shards. BTW, how much units do you guys think the mega boss rush will cost for me? I have 4 4* 5/50s and 1 3/45 5 star. So what's your guy's opinion? I feel like the boss rush will give me way better rewards. (I'm doing master so in total if I do everything I will get 10k 5 star shards, 6 t4b, 6 t4cc, 1 t2A which is super valuable to me, 9000 T5B also very valuable, and 6 T1A meh.)
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Thats a good idea but for the Omega boss rush what will it be like? Will it be like significantly harder than the ones before? I just want to make sure I can do it.
I would focus on 5.2.6, become Uncollected, and in the meantime pick off the Boss Rush difficulties you can do without spending. The rewards always look juicy in the higher tiers but if you have to spend units and aren't made of money this is an unsustainable chase. If you're going to spend, spend on something specific that will give you long term benefits and isn't just one more thing to spend on.
With that said, you’re going to have a hell of a time in the top difficulty with your roster, so I probably wouldn’t spend a unit on it, and just use it as a practice tool.
If you can get Thing and Diablo down without units, and have a counter for Sinister then you’re probably good to do the whole thing.