I've owned the intercept, optimus v, and triumph, and the triumph is by far the best in my opinion. He is right about the optimus being a nice phone, but performance wise it doesnt even come close to the triumph. On froyo overclocked to 825 mhz i scored around 610 with the optimus with quadrant standard. The triumph can overclock to 1.9 ghz and i got 2960 on the same os. The only real problem i ever have with the triumph is the back key sometimes doesnt work, but turning the screen off and on fixes that. If you read around just about all the issues have been worked out. I absolutely love the phone.
of course the triumph is going to be more powerful. that doesnt mean its a great phone YET.
it has too many manufacturing problems (back button as you mentioned, screen flicker, touch screen issues) the OV has been out for long enough that the first batch of phones kinks were worked out. now 99% of OVs are up to spec and perform well.
you can wait another month and get a triumph that has a better reliability factor, but its still made by huawei. gotta give them credit for trying, but they actually are well known for making kinda *cough* crappy phones. and it shows.
when LG releases the optimus Black for Virgin, I have no doubt in my mind that it wont be without its own share of first run manufacturing issues, but given LGs history, they will be minimal and the entire phone will be of higher quality from the start.
They already have the "Optimus" brand name to live up to. they know they have to make a great phone for the prepaid and budget markets, they knew that with the Optimus One line as well
*edit* im not flaming on the triumph. I think it has potential, but im giving my opinion to the OP that if they want a good phone right NOW the options are
1. try your luck with the triumph, might get lucky, might get a crap one.
2. buy the cheaper OV for the meantime and get the reliability of a matured phone, at least until the black rolls out or wait and see if the Triumph gets more reliable. becuase its clear that it has problems right now that the V doesnt