KDF toons should favor the Chel Gret since (1) KDF doesnt have anything else with that turn and BOFF seating (the closest you can get to it is the Fleet Kamarag), but (2) they do have BOP raiders and the Plesh Brek is kind of redundant with those (it does have more firepower however, at the expense of battlecloak). I will be taking the Chel on my KDF science captain, since she needs a heavy ship that is able to push out a lot of weapon damage while still supporting science abilities.
Fed has ships that are comparable to both, but some holes in the lineup make both ships viable in some pockets. Specifically, Fed has several tac-heavy escorts, but only one sci-heavy escort (Advanced), and no engi-heavy escorts (except the Steamrunner which is only available for $$ from Steam). Meanwhile, Fed also has multiple science vessels that occupy a similar power point as the Chel a well as the Heavy Escort which is very close (but tactically centered). Taken together, the Plesh Brek is a real opportunity for Fed engineers in particular. Science captains have other options with the Advanced Escort and the Science ships (Nova frigate through Nebula cruiser) but can take advantage of either Breen ship due to seating options. Tac can also leverage both of them due to flexibility, and the Plesh is faster and stronger than many Fed ships too. As of right now, I am planning to take the Plesh for my Fed engi captain (only) but I might also take the Chel for my Fed tac to fill a hole between the tac escorts and tac cruisers. My sci will use the Advance Escort, and my engi is planning to get the JHEC, so the Chel is redundant for them.
Romulans have the toughest choice. The T'varo Retrofit is quite comparable to the Plesh Brek, especially if you get the fleet version, with an enhanced battlecloak, while the Plesh has slightly faster turning and the flanking bonus. The T'varo seating is flexible enough to be used with any profession. Meanwhile, the Dhelan is faster than the Chel Gret, with more firepower, and has a battlecloak, however the Chel has a bit more hull (36k vs 31.5k) and has 8x hard-points that make it a better beam boat. I'd rather play the Romulan experience and these are not different enough, so I'm not going to claim either ship on either of my Romulans.
I'd go for the warship and continue the races, save up the pictures. I'm willing to bet this years ship will be available next year like last years is available this year, no telling if last years ship will be available next year though.
Check out my ideas for the game here
First, Vice Admiral, U.S.S. Wolf Pack-F, NX-101687-F
First., Vice Admiral, A.R.W. Moon Wolf
Wolf, I.K.S. Frost Bite