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It's a big trade off and balance system. For domestic stuff, go with BBTS and their Pile of Loot system or use Amazon if you have Prime already (but factor annual prime costs into your total costs to see if you expect to actually save money).
For import stuff, amiami and HLJ are good maybe 1 out of 5 times for buying things, because more often than not you're going to get it 15% cheaper on mandarake. That 1 in 5 that justifies HLJ/amiami is for the odd figure that just skyrockets on aftermarket immediately and never lets up, in which case mandarake will hose you. But to add to this, if you are high volume in your import purchases, HLJ might come out on top if you utilize their Private Warehouse and save on shipping versus mandarake which spreads its ware between several shops and might force you into several separate shipping expenses.
But honestly, never fucking go with amiami. There's zero reason to do it.