Best in what way? The Blood Angels are by far the most noble and most beatific by virtue of Sanguinius. They're also the fighty-est of the more "codex" Space Marine Chapters. The Dark Angels are a bunch of secretive bastards, who are as psychologically scarred as the Blood Angels but are more somber in how they deal with their bloody past. They're by far the shootiest of the Space Marine variants. The Ultramarines are Spartan, bland in every sense of the word, but set a standard with which the entire Adeptus Astartes functions. And for some reason, blue does look quite sharp on the sons of Roboute Guilliman...
As for which Chapter plays the best overall... it's ultimately in the hands of the player. I've seen Ultramarines armies outfight World Eaters in close combat in the hands of a skilled player, and I've seen Blood Angels outshoot Tau. Personally, I think the Black Templars are the best of the variant lists, purely because they combine exceptional close combat skill with what's essentially Codex: Space Marines quality firepower.
I'm gonna say that of those listed in the original post, I prefer Dark Angels. They have more character than UltraSmurfs, and more variety than Blood Angels. And, while they can be one of the shootier SM armies (granted compared to IG and Tau, that's not too shooty), DA can also be a very effective CC army as well.
But, despite my opinions on named chapters, I'd still go DIY.
I'm not talking spray painted blue with yellow here and there, I'm talking highlights, drybrushing, flocked bases, dynamic character basing, and conversions aplenty. There's a way to do ultramarines and still look original.
Best? Best for what? Just different really. If you want a close combat force then Blood Angels is what you are after.
IMO Paint up your own Chapter colours and use which rules you fancy on the day.
This means you can add whatever minis you like to your SM army and can play different styles when you fancy.
Just let your opponent know that ' this is my sucessor Chapter and they are really X Angels/Marines when it comes to the rules.' :wink:
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