I suppose I like the M4 Jumbo, because I have met few Germans who have even ever heard of it and it fun to pull their legs about it. -you may dispute whether it was fitted with the 90mm...
I think it 'best' because the Germans thought they were dealing with something other than what it was.
Only a few hundred 90 MM Sherman field modification conversion kits were shipped between late summer '44 and spring '45..
First photo-
90 MM Sherman in Battle of the Bulge, (retro fit, no muzzle brake and the turret is definitely not the modified M-10 /90mm (M36) 'pyramid' variety)
see link:
The Battle of the Bulge: Images
And yes, there were more US 90mm equipped AFV in the West than Tigers and Panthers of all sorts combined.
Another 'fun one' is the US 155 SP AFV..fitted with the Pozit (proximity fuse) elsewhere voted the deadliest vehicle on any battlefield.
This is what stopped Piefer at LeGlieze
The Battle 21-25 Dec
Many fine photos etc in this link
Although Huge Cole, in writing the official US Army history of the battle discounts this as over hyped..
But other books, like 'A Time for Trumpets" McDonald dispute Cole.
Patton, considered a historian in his own right, would not talk to Cole, he considered him an idiot.
Chapter 25-THE ARDENNES: BATTLE OF THE BULGE
Two battalions in the VIII Corps artillery had been issued some rounds of VT ammunition, but so far as can be determined none were fired on the first day of the German attack. Actually this highly secret ammunition was employed on only a few occasions prior to the Allied counterattack in early January, and then usually at night or in poor weather when the American gunners could not get sensing for normal time fire missions. The postwar claims as to the value of the much touted [655] VT fuse in halting the German advance are grossly exaggerated. (1/4 down the page)
This on line book is fairly decent reading and fairly accurate with plenty of post battle / post war interviews.. and it is free.
>You cannot always trust some accounts, Fritz Bayerlien in "Breakout and Pursuit" (Cobra) accounts for more losses than the official Wehrmacht records for instance.
The European Theater of Operations - U.S. Army Center of Military History
More on the SP 155
Aachen, used to hunt snipers..
http://cpof.ida.org/MOUT-Aachen-1944.pdf
Urban Operations - An Historical Casebook
The Siegfried Line Campaign: Chapter 13
With the concrete busting (delayed) fuse it was used to blow through 5-6 houses, then it could destroy a Panther at the end of a row (block) of town houses. (Koln)
(The surrendered German commander complained bitterly about such tactics..)
Many Germans also seem unaware of this vehicle and the direct fire effect of its 50kg round on a tank. Its range was approximately 30-40 Km. (18-24 miles) and yes it could kill a Tiger at more than 100 meters..(or 20,000 meters like at Le Glieze)
The vehicle also used the 8 inch (203mm) naval cannon and the M40 was fitted both ways and if supported by a platoon, it was very effective in all roles.
from link
Daniel brought up his attached 155mm self-propelled gun for the purpose. To protect it, he ordered tank destroyers to fire into the intervening cross streets. To protect the tank destroyers, infantry secured the buildings within panzerfaust range of the armor. Once in place, the 155 utterly demolished the "pillbox," which later proved to be a camouflaged tank.[36]
The 2/26 continued its methodical advance on 17 and 18 October (see Map 6). The 1106th Engineer Group continued to displace forward to cover the battalion's flank. As it advanced, the 2/26's front widened. The 1st Infantry Division attached Company C (1/26 Infantry) to Daniel's command, where it assumed responsibility for a zone on the right flank.[37]
During this period, the 2/26 found itself taking fire from the rear, despite all its precautions to assure that no Germans were bypassed. After a careful search, the Americans discovered that the fire was coming from a church steeple that had been reinforced with concrete, making it a fortified observation post. This position proved to be impervious to both small arms and 75mm tank destroyer fire, whereupon Daniel again called upon his 155mm artillery piece. One shot from the 155 brought the entire structure crashing to the ground.[38] This use of a 155mm gun as an anti-sniper weapon is perhaps the epitome of "Knock 'em all down."
You can google "Aachen 155 mm Daniel" for more..