No program does everything that another does. Even when they both do the same thing they don't do it equally well. And nowadays chess database programs have so many features no chessplayer can use them all.
So if moving from ChessBase to another program, the first big question must be, which ChessBase features do you, personally, actually use? Only then can you know if another program would be a good replacement. (Although serendipity happens. This replacement program might have a feature ChessBase lacks, which you didn't even realize you wanted.)
Since SCID vs PC is free I think you should evaluate that one yourself. I use SCID, I haven't looked at SCID vs PC but it seems similar.
As to Chess Assistant, ChessOK is a Russian company. There is a whole other universe of chess in the Russian language. It's possible for a company to thrive in that arena and for Western chessplayers to never hear of it. So I wouldn't worry about ChessOK just yet, although nothing lasts forever and this is true of ChessBase as well.
Many moons ago I started with Chess Assistant for DOS, and through all the versions have always preferred CA to ChessBase. Chess Assistant can open ChessBase's proprietary .cbh format (read-only), so that's a big help. For me the biggest advantage is the Chess Assistant tree. I use a tree all the time and the ChessBase tree simply cannot compare. I would rank the trees Chess Assistant clear 1st, SCID and HIARCS Chess Explorer neck-and-neck 2nd and 3rd, ChessBase distant 4th, more like an also-ran. One thing that drives me crazy about Chess Assistant is, ever since Windows Vista I cannot see the +- "winning for white" ($18) symbol. Convekta (in those days) told me they couldn't fix it and I should run it under Wine, which I did, but nowadays Wine does the same thing. I have a different workaround for myself but couldn't recommend it to others. I am using an old version of Chess Assistant (I have CA17 but prefer and use CA10), maybe the latest version has fixed this issue. One would hope so. It's something to do with the fonts, maybe it works if you have a Russian version of Windows? They must have different system fonts installed anyway.
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